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Rob talks through what could happen next in the Strait of Hormuz with Commodity Context’s Rory Johnston.

This transcript has been automatically generated.
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[1:10] Hello, it is Thursday, April 9, 2026. The United States and Iran have agreed to a two-week ceasefire, and thank goodness. But the terms of the truce are still far from settled. Iran has put out a 10-point peace plan that looks a lot like its pre-war demands, but it also now wants to toll the Strait of Hormuz and charge $1 for every barrel of oil that passes through the waterway. More broadly, we don’t know what each side in the ceasefire thinks it agreed to, and we don’t even know whether Israel considers itself to be bound by the agreement or not. Now Trump initially sought the ceasefire to calm down the stock market and the energy markets.
Robinson Meyer:
[1:46] And markets were initially becalmed. The S&P 500 has surged 5% in the past five trading days, and U.S. Oil prices initially fell on the news. But the energy crisis still isn’t over. Oil prices are well above their February levels. They’re actually slightly up in trading today. The liquefied natural gas market is totally scrambled. And most importantly, as you’ll hear, the Strait of Hormuz is still closed. Well, when the news came down, there was just one person I wanted to talk to. Joining us today is Rory Johnston. He’s an oil analyst and the author of Commodity Context. He’s been the indispensable voice on the Hormuz closure since the beginning. He’s also a longtime friend of the pod. I think this is his third time on ShiftKey. We’re going to talk about what could come next, why Iran doesn’t mind the new status quo, and what the ceasefire could mean for Asia, Europe, and the rest of the world. We’re also going to talk about why Illinois probably has the cheapest gasoline in the world right now.
Robinson Meyer:
[2:36] I’m Robinson Meyer, the founding executive editor of Heatmap News. It’s all coming up on ShiftKey.
Robinson Meyer:
[2:46] Rory, welcome to Shift Key. Thanks for having me back, Rob. So good to have you. So let’s just start here. We are recording this on the morning of Thursday, April 9. As of this morning, is the Strait of Hormuz reopened?
Rory Johnston:
[3:00] No. I’ll leave it simple there. No, the Strait of Hormuz is not reopened. If the goal of the ceasefire was to reopen the strait, it is thus far failing to achieve that goal. In fact, on the first day of the ceasefire, which was yesterday, we actually had a reduction in the traffic that transited the strait. By the estimates I’ve seen, only four ships were allowed to pass and none of them were tankers. So prior to the ceasefire, we had Iran allowing a larger number of ships across in the kind of like low double digits, like 10 to kind of 15. And that was the expectation. So that’s the baseline that we’re working off of. And yeah, we haven’t exceeded it. And in fact, we’ve actually kind of pulled back from those levels. Obviously, on the first day of the ceasefire, I’ve been noting that there was a lot of fire, widespread attacks by Israel against Lebanon, which Iran includes in the ceasefire, as does the Pakistani PM statement. And both Israel and the White House believe that it is not included. And there’s a whole bunch of contradictions across the board on this ceasefire across the various terms. So there’s no telling at this stage whether or not the ceasefire even holds. And obviously on the first day, Iran viewed the situation as being kind of multiple violations of the ceasefire and reacted accordingly by further throttling the Strait of Hormuz.
Robinson Meyer:
[4:32] So let’s talk about a few different branching possibilities here. I think the first that I want to focus on is like, let’s assume for the moment that the ceasefire holds for the next few days. Yeah. And so let’s just talk about kind of the immediate setting of the Strait. And then I want to zoom out and talk a little bit more about what this new status quo, or at least what a kind of continuation of the current situation could mean for Asia, could mean for energy markets around the world. But just looking right now more closely, as part of its peace proposal, Iran wants to toll the Strait of Hormuz. And we’ve heard this figure that’s maybe a dollar per barrel of oil. There’s some discussion that it could also include fertilizer or LNG or other kinds of goods that pass through the Strait of Hormuz. Just like what would that mean for other Gulf producers, for global energy markets, for, let’s say, the global oil trade as compared to especially the situation before February 27 of this year?
Rory Johnston:
[5:21] Let’s start by comparing it to the current situation, because I think it’s important to think about relative because we’re no longer in a pre, you know, in a February world.
Robinson Meyer:
[5:31] And that status quo, just to confirm is like fully gone forever.
Rory Johnston:
[5:34] Yeah, well, the status quo is basically that the Strait of Hormuz is closed. All of these countries in the Gulf cannot export their the product from their main industries. So you’re seeing basically zeroed out production across much of the Gulf. The Iraqi Basra fields, Kuwaiti production, and both Saudi and the Emiratis are also down considerably. Overall, right now, we have roughly, by my estimate, 13 million barrels a day of liquids production. So that’s between crude oil, natural gas liquids, and gas condensates shut in the region. And so long as that continues, as long as we do not get a reopening of the strait, that will persist. So that the global oil market is hemorrhaging roughly 13 million barrels of fuel every day that would have been produced if this war were not happening that is now not being produced. So when we talk about this tolling arrangement, a lot of people will, I think, very reasonably and rightfully say that such an arrangement where Iran controls the strait and charges a toll is politically impossible, therefore it won’t happen. I definitely think it’s politically unpopular. I think that, you know, you will not see the Gulf monarchies happy about it. But I think relative to the current situation, it is better for everyone. It is, you know.
Robinson Meyer:
[6:47] A dollar a barrel is not a lot in the scheme of things. It’s very expensive for a toll transit, no doubt, but it’s very cheap in the scheme of like a barrel of oil that’s currently trading for, you know, give or take $100. And, you know, that’s just part of the shipping arrangement. And that can easily be like if we were talking about an oil market that was one dollar a barrel higher, no one will be talking about the oil market. That’s not the situation we’re facing.
Robinson Meyer:
[7:10] We did the math yesterday to figure out what it would be as a carbon tax. Obviously, it’s not really a carbon tax, but what would it be on a per ton basis? The answer is $2.33, which is really a pretty negligible carbon tax.
Rory Johnston:
[7:22] Yeah, it’s de minimis, let’s just say. So I think in that situation, I could see that happening. The challenge is getting Iran to a stage where it will allow that to happen. Because the important thing here is that Iran wants to control and maintain control, because obviously it does control right now, the flow rate through the strait as well. So it wants to be able to modulate how many ships are getting through at any given moment. It knows it’s on those ships. So it knows the difference between, let’s say, a VLCC tanker carrying 2 million barrels of crude and a smaller tanker that’s carrying 50,000 barrels of jet fuel. It will charge a fee accordingly, but it wants to maintain pressure on the global economy because that is its main point of leverage in the war with the United States. And what we’re seeing now with the ceasefire is that clearly Trump wanted the strait completely reopened during the ceasefire. And of course he does.
Rory Johnston r:
[8:15] But Iran has no interest in kind of playing ball along those terms because doing so kind of, again, removes its pressure from the system. And as I think we’ve talked about before, that this is something with the closure of the strait, that the pressure builds up over time. So right now, Iran is at kind of its peak point of leverage, and arguably, it would even be in a higher or kind of greater leverage position in two weeks, so the situation remains the same. So in many ways, if we were thinking that the pre-ceasefire level of shipments was, say, like, let’s say 10 to 12 ships. And what we’re hearing now is that Iran is planning on limiting passage during the ceasefire, even once it allows passage to resume again, which again, it wasn’t yesterday, at kind of 10 to 15 ships. That’s more or less the same thing as was occurring over the prior week. And if you maintain that level, it lets a little bit of the pressure out, it lets kind of, you know, food shipments go through and kind of allow some of the humanitarian aspects to play out. But in terms of the pressure on the global system, that remains largely the same. So in some ways, a two-week ceasefire where Iran is not being bombed, but it continues to throttle the strait and continues to build pressure on the global economy is the ideal geostrategic outcome for Iran. It has a chance to catch its breath. All the while, the global economy cannot catch its breath.
Robinson Meyer:
[9:35] I saw you were just citing this kind of 12 ships a day figure before February. Yes. Regular passage to the Strait of Hormuz was 100 ships a day. Now, there’s a ton of ships that are stuck on the other side of the strait. And presumably if the strait were fully open, they would all try to basically file out at once if it was seen as safe and tenable and doable. But 12 ships a day is like 10% or even less than what it used to be.
Rory Johnston:
[10:02] That’s correct. And also, we should say this is not 12 ships that are going west to east. This includes ships that are going both directions. So, you know, it includes and many of those ships are Iranian ships, both leaving and returning. One of the bizarre aspects of this conflict thus far is that Iran has continued to produce and export its crude the entire war, which, you know, ask any oil analyst pre-February if, you know, in their world vision of a strait of Hormuz closure, would Iran be getting its oil out? And the answer would have been obviously not. We had just seen the U.S. Navy very successfully blockade Venezuela and literally chase down ships trying to escape across the ocean. They can enforce a blockade they chose not to. And I think this goes to this point that like, the White House is acutely sensitive to the energy price pressures, even though many people claim that
Rory Johnston:
[10:54] Oh, this is part of the grand plan to flex U.S. energy dominance on China or wherever else. Then no, they’ve allowed Iranian ships to continue transiting. They’ve removed sanctions on Russian floating storage that had been actually quite effective at tightening the noose around Moscow. And they’ve even officially removed sanctions on Iranian crude that was floating at sea, which enabled India to actually purchase its first Iranian oil since the scuttling of the JCPOA back in the late teens.
Robinson Meyer:
[11:23] Well, Eddie Fishman, the author of the book Choke Points, has made this point repeatedly that Iran has received more sanctions relief for closing the Strait of Hormuz than it did for giving up its nuclear program in the JCPOA. Like literally the number one thing that has resulted in Iran getting sanctions, like Iran got more sanctions relief from taking bellicose actions than it did at any point during the previous diplomatic process or any point during, you know, a Trump led diplomatic process for that matter.
Robinson Meyer:
[11:51] Okay, so we have the Strait of Hormuz right now. It’s building up pressure. The status quo at the moment increases Iran’s leverage and seems to decrease the U.S. or at least the global economy’s leverage. Can you give us a view of what’s happening in Asian oil markets and Asian energy markets right now, which up to this point have been the locus of the disaster in supply side shortages? We’ve seen spot prices there get very high. We were just talking about how ships are failing to make it out. But basically, what is the situation in Asia today? How close are things to breaking? And just play out the next two weeks for us, both in Asia and around the world, where let’s say that Iran does keep allowing, say, 12 ships a day out. The U.S. doesn’t want to resume bombing, but Iran maintains this point of leverage. What does that look like for the rest of the world?
Rory Johnston:
[12:42] Prices continue marching higher. I think immediately before the ceasefire and the belief that the strait was going to reopen, Brent Crude was trading at, and this is June futures, and this will be an important differentiating point that I’ll elaborate on in a second. Those were sitting at about $110 a barrel. And following the ceasefire announcement, they dropped to about $90. And they’re just back below $100 today. So we’re kind of at a 20% route, and we’ve retraced about half of it. I think that if this continues, we’re going to continue to see mounting scarcity across Asia and increasingly Europe. So, you know, I was mentioning that it was June futures. One of the important aspects of this conflict thus far is that by far the lion’s share of the pricing pressure and the kind of pain is being felt by spot markets of physically available supplies that are increasingly scarce. This manifests as an explosion of what we call backwardation, which is essentially, you know, a premium on near-term cargoes relative to later-term cargoes.
Rory Johnston:
[13:43] That is what we’d expect in an extremely scarce supply environment. But I think also, normally, I would really push back against claims that, like, there’s some kind of forecasting in the curve here. But I think it’s also hard to say that, like, that isn’t playing somewhat into this as an expectation that, yeah, this has to end soon. One thing I’ve been really commenting on is that the closer you are to the oil market and the more you appreciate the crisis and the consequences that we would be facing, the more optimistic you are that someone’s gonna figure out a way to avoid that happening because the consequences are just so extreme.
Robinson Meyer:
[14:20] It’s reminiscent of COVID in this way, where the closer you are to the actual bioscience or the closest you are to the actual physical thing happening, the more alarmed you’ve been or the more confident that something has to change because the reality is so bad.
Rory Johnston:
[14:33] Yeah, I think I mean, there have been a lot of kind of parallels to the kind of COVID aspect that you can see the wave like the epidemiological wave coming from Asia and then through Europe. And then like, oh, well, we’re in North America, it’ll be fine. And guess what? We weren’t. And the same thing applies here. The benefit, I think the difference here, obviously, from COVID is that while I strongly push back against the claims by the White House that, you know, the U.S. is a net beneficiary from this, I think it’s hard to argue that North America is not the single most energy secure kind of major consuming region in the world right now, that there’s the least dependence on Middle Eastern oil. There is the most domestic supply that would be hard to incentivize away, both obviously, you know, shale production in Texas and New Mexico, but also the lock in of Canadian exports, obviously, Canadian exports and pipeline politics very near and dear to my heart. But most of Canadian exports end up shipped through the U.S. Midwest, where you have arguably the least avenue or optionality for being incentivized away by desperate Asian buyers.
Rory Johnston:
[15:42] So Canadian exporters, as an example, have shifted some additional supplies out the West Coast through the Trans Mountain Expansion Pipeline. But that was only maybe about 100,000 barrels a day of possible flex. The rest is still locked into the U.S. mid-continent market. And when you look at a map right now of where prices are in the United States, you see a massive spread between the coasts and the center of the country. And the reason for that is that, one, the center of the country is largely self-sufficient in these fuels and doesn’t need to import from external sources. And there isn’t, and they don’t face that kind of same degree of maritime pressure, or kind of seaborne trade pressure. If you’re on a coast, you’re competing functionally with everyone else on planet Earth for that cargo of diesel.
Rory Johnston:
[16:24] Whereas in the mid-continent, if you’re like around the Chicago area, well, you’ve got refineries and you’ve got stranded Canadian crude that you can refine to whatever you want. So prices overall will continue to march higher, but you will increasingly see geographic spread in the United States. And increasingly, those, you know, supply parched regions and consumers in Asia and increasingly Europe and even Africa are going to continue bidding barrels away from North America, etc. You’ve actually seen in the first kind of wave of this, the first major consuming region to run out of Middle Eastern oil because it’s the closest by destination was actually East Africa. You saw, for instance, cargos that were transiting from the U.S. Gulf Coast up towards Europe, kind of abruptly break south back around the Cape of Africa, back to basically East African importing economies, because that was the place where that physical shortage bit first, and they were so desperate to buy it, they would pay, you know, an arm and a leg to incentivize that tanker to bail on its planned Europe trip. That’s the kind of thing we’re going to keep seeing around the world until that pricing pressure kind of equilibrates at a level that everyone is getting what they can at the prices that they can afford. But the final thing I’ll stress here is that with enough time, if this normalizes, if we’re talking about this situation for months and months and months or a year, God help us.
Rory Johnston:
[17:47] That is the situation where I do not think that the majority of the Western advanced economies are going to see material shortages.
Rory Johnston:
[17:55] It will just see extremely high prices. The kind of the burden of the necessary demand destruction, again, we’re talking about if again, if we don’t reopen Hormuz, we’re talking about 10 plus million barrels a day, 10% plus of the global demand base needing to be shed. So you don’t break the oil market. That burden will be largely borne by poor economies in the global south. That is just the kind of really tragic and vicious logic of the way that the system is going to solve itself.
Robinson Meyer:
[18:24] One dynamic that you’ve just really described well is the way that very high prices and shortages can be hard to distinguish. That being said, it sounds like we’re beginning to see true shortages appear in East Africa. Are there other places in the world or other refined products where we’re seeing either spot prices so high that it’s impossible to see it as anything other than a shortage or true like places are supposed to have oil, they’re supposed to have some kind of refined product and they don’t right now?
Rory Johnston:
[18:54] Yeah, I think it’s important to differentiate between the kind of short and medium term effects here. Because as an example, Europe, Europe gets a decent chunk of jet fuel from the Middle East. Rather than crude oil, it actually just directly imports the jet fuel because of that 20 million barrels a day that exits Hormuz, roughly 15 million barrels a day of that is crude oil and 5 million barrels that is refined and kind of in products. So about half of that 5 million is middle distillates like diesel and jet fuel. And the other half is natural gas liquids, condensates, et cetera, that go into petrochemical processing. Those shipments of jet fuel that would be going to Europe, once they stopped, those can be filled theoretically by pulling and kind of incentivizing stealing, in a way, those barrels from other regions of the world with higher prices. But that takes time so in the interim, the short-term logistical air bubble that’s hit us, the air pocket that is manifesting as shortages in Europe already — you’ve already seen, for instance, Italy last week was announcing that at various airports they were beginning to ration jet fuel to, say, long haul flights versus short haul flights that are by definition less fuel efficient because so much of the fuel is used in takeoff, as well as kind of like prioritizing air ambulances and other kind of emergency air travel. That is something that we will continue to see. You’ve seen in Asia, which was the epicenter of this initially, you saw, you know, large scale flight cancellations, route reductions, and all manner of government policies that all kind of feel very COVID-esque, meant to reduce mobility, meant to reduce consumption. Because for those other economies, and again, the other aspect of this that’s interesting is that.
Rory Johnston:
[20:33] For a lot of emerging markets, again, these areas that would be hit hardest by this, they also typically end up having some of the highest fossil fuel subsidies for, let’s say, pump prices. So if the governments don’t relax those subsidies, this transforms in the initial phase from a consumer crisis of disposable income erosion, kind of recessionary pressure, to a full-blown governmental fiscal crisis as the pressure gets borne by public balance sheets. So I imagine that as this continues, you’re going to see governments increasingly need to roll back these subsidies, even though all the political incentives are going to go the other way, but no one’s going to afford it. So I think it’s another thing we need to watch.
Robinson Meyer:
[21:11] When you talk about these countries having very high consumer subsidies, what countries are we talking about? Because the countries I think about as having the highest oil side consumer subsidies are the Gulf states. Is that kind of what you’re thinking about? Gulf states, but also, for instance, like, you know, India and Bangladesh have controls on petrol prices that are meant to kind of shield consumers from the volatility in these markets. And whether or not that’s allowed to continue that, you know, you’re going to need to allow price signals to do their work. Otherwise, you’re just going to not allow the system to kind of heal itself. And that’s how you in the same way as like if we rewind our memories back to the 70s, when Nixon instituted price controls on gasoline. That was the main reason that you ended up getting gas lines was that these markets weren’t able to incentivize the necessary barrels to where they were going.
Robinson Meyer:
[22:02] In North America, the fuel that we’ve seen the most pressure on is diesel so far. Diesel prices are extremely high in a way that gasoline prices are high, but they’re not that bad. It’s funny, going back to your previous comment, I have been looking at maps and thinking, I wonder if Iowa or Illinois has the cheapest gasoline in the world right now. And it sounds like it actually does. Pretty close. But with diesel, we’re beginning to see really eye-watering prices. And one comment I’ve heard from people in the oil industry is it’s kind of surprising the Department of Energy hasn’t started to at least talk about plans for rationing this yet because we are getting to a price level where you would see physical shortages or at least diesel not making it to places where it would normally be making it. Do you think that it’s premature to be talking about the federal or Canada national response to these high diesel prices? Or should we actually be starting to plan for what a continued world of very high diesel prices that requires some degree of rationing and some degree of kind of physical allocation to certain geographies looks like?
Rory Johnston:
[23:07] Yeah, I mean, it’s an interesting question. Just going to give some of the numbers here. So we typically think about diesel or refined product pricing generally in terms of what we call the crack spread or the difference between crude oil and the refined product. You know, at the beginning of the year, a barrel of diesel in New York Harbor was trading roughly $30 above a barrel of Brent. So that’s a crack spread of roughly $30. At the peak in, what was this? This was March 23. We hit $90 a barrel diesel crack spreads. And currently they’re sitting at about $72 a barrel. So they’ve come down a little bit. Again, there’s a lot of hope in the market that this is almost over. But that has been where the middle distillates, diesel, gas, oil, jet fuel, have been the epicenter of the crisis in the product space.
Rory Johnston:
[23:54] And that’s actually been something that’s been pretty consistent since at least 2022. That since the crisis then, we also saw the most pricing pressure on diesel. And basically, anytime something goes haywire in the oil market right now, diesel is kind of leading the charge higher. So that’s just the fuel that we have the least of relative to still strong demand. If you think about it from an energy transition perspective, you’ve had a lot more energy transition, demand erosion in gasoline.
Robinson Meyer:
[24:20] It totally makes sense. Yeah, I mean, it makes sense. We see all the demand destruction in light vehicles, right? Exactly, exactly. And you haven’t seen the same thing. There’s been an increase in online shipping in retail, right? And kind of broad freight traffic across the country. All of that. It, totally. When you think about the two big trends in the economy. Yeah, totally makes sense.
Rory Johnston:
[24:38] And even on the supply side, because if you think about where the majority of supply has come from recently, it’s been coming from the United States and the shale patch, which produces very light grades of crude, and which yield much higher natural volumes of gasoline relative to diesel. So basically, if you’re thinking about the crack spreads right now at $72 a barrel, and you’re thinking at Brent at about $100, what you’re really talking about is $170 a barrel for diesel at the pump. I have a hard time believing that, you know, explicit rationing or other kind of policies like that would have the desired effect, because it’s gonna be really hard to figure out exactly where should have the most diesel in the first place. And I understand that there’s going to be arguments around equity around regional distribution.
Rory Johnston:
[25:21] But I do think that relative to say the 1970s, our economies are so much less oil intense. Now, I think there is a high degree of kind of spending power in particularly Western markets, and that they can handle much higher prices without things really breaking. Now, yes, this is going to be a regressionary tax, and all the normal things we kind of worry about in these moments. But overall, I think the price mechanism is something that we can at least reliably, passively trust to allocate the fuel in a way that doesn’t result in shortages. As soon as you begin rationing, as soon as you begin, I mean, what we’ve learned from government through many of these crises is that governments are kind of bad at working through the fast moving dynamics of these markets. As an example, things are changing daily right now. The government doesn’t work that fast. And we saw that through 2022. We’ve seen that through everything that it takes a long time to get a policy going. And even after it’s going, like we saw with the SPR release in 2022.
Rory Johnston:
[26:19] By the time it was really going, it was barely needed. And they weren’t able to stop it because like, well, we just spent so much effort getting this thing going. It’d be a shame to turn it off. And I feel like that same thing I see consistently across the market now. So I’m very skeptical that’s going to be the way to fix it. I think much more realistically, you know, all that same pressure and all that same energy should be just turned into trying to facilitate a reopening of the strait. Right. And again, those high prices are also needed to begin. Like, let’s say in a world where this thing lasts a long time, we still need the price signals to incentivize additional supply from elsewhere or, again, kind of demand destruction. I think it’s, it should be up to consumers to decide when they cut back.
Robinson Meyer:
[27:04] Let’s cast our eyes forward. So right now, the strait remains closed. Of course, we’re kind of dancing around it a little bit, but Iran has won a massive strategic victory in at least being allowed to even having the possibility of a permanent toll on the strait being under consideration. It’s a massive change from the pre-war status quo. It puts the IRGC in a much stronger position maybe than it was previously. And it also, I think, would be the first time a country would be allowed to toll a natural waterway like this. You’re kind of allowed to toll a canal like the Suez or Panama, but you’re not supposed to be allowed to toll a straight. It’s an international waterway, right? Exactly. And yet here, Iran seems like it’s going to do it. So yesterday, the S&P 500 was up about 2.3%. Today, it looks like it’s down maybe 26 basis points so far.
Robinson Meyer:
[27:55] But one reason the market has reacted really jubilantly to this is that it’s basically taking the signal that Trump is going to do whatever it takes to reopen the strait. And that we’re not going to see a massive escalation in Iran in a way that would really imperil the strait and keep it closed for longer. Let’s just play out some different possibilities here. It’s in Iran’s advantage, as you were saying, to keep the strait closed for as long as it can because its leverage increases throughout that process. Give us a few different ways that this ends. One possibility seems to be that Iran begins to toll the strait and allow a greater number of vessels every day. And as the ceasefire persists, global pressure on Iran, which could come from India, which could come from China, which could come from the Southeast Asian countries, increases to the point where Iran feels like it needs to raise the number of ships that it allows through the strait. There’s another world, though, where Iran doesn’t really ever open the strait, at least for the next few weeks. And the U.S. says it’s observing a ceasefire, but the strait remains closed. What does that world look like? And how do you kind of map out the possibilities here?
Rory Johnston:
[29:11] Yeah, I mean, we’re deep, deep in the kind of like speculative scenario world because there is no base case right now. I think it’s anyone that has a really confident base case. I wish I had their confidence. But yeah, so let’s work through the world of what that looks like. I think the important thing for Iran is that it will, it’ll want to maintain pressure through the strait as long as the war is continuing to go on. Now, the ceasefire is tenuous. It’s kind of precarious. I think we haven’t even talked about all of the various disputes around the kind of conditions, whether it’s about domestic enrichment or the status of Lebanon or the status of the strait itself. There are many, many, many, many points of disagreement, many of which are actually the same points of disagreement that Washington and Tehran could not agree on in mid-February before the war began. So we really haven’t moved a lot in terms of the diplomatic stance.
Robinson Meyer:
[30:01] And kind of crucially, what’s happened since then, right, is that the U.S. Has discovered it can degrade, but perhaps not destroy without some kind of ground operation, Iranian missile production. Iran has won this massive strategic victory in gaining an upper hand on cross-strait traffic. And we’ve discovered the U.S. seemingly has no domestic political appetite for a sustained war in Iran. Yeah. Even though there were all these political points of pressure in February, it does seem like Iran is in a much stronger position than it was, you know, two months ago.
Rory Johnston:
[30:35] I would agree. I think particularly coming out of Israel’s very successful obliteration of much of Iran’s proxy network in the region over the past couple of years, and then following the 12-day War last year, it increasingly seemed externally that Iran was a paper tiger. And I think this is kind of, you know, pushed back on that pretty, pretty strongly and pretty clearly. I think going into this war, Tehran’s only primary strategic objective was survival. And I think they’ve proven that they have survived, there will be no regime change, despite what the White House says is the same government. It’s, it’s literally, it’s literally the Ayatollah has the same last name, right? I think it’s like, it’s, it’s about as clearly the same regime as it could be with just different people at the top, which is like, that doesn’t mean this. That wasn’t going to be a bad thing for Trump, as we saw in Venezuela the last time we chatted in early January. But I think that that is something that kind of has to be a part of this.
Rory Johnston:
[31:31] And then, you know, but rather than just survival, now I think that Iran is trying to figure out a way to kind of benefit geostrategically coming out of this. And that’s where the strait comes in, is that, you know, they had always teased about closing the strait historically, threatened it. But there was a lot of skepticism, very frankly. I was even fairly skeptical that they would be able to successfully close it. I was more skeptical that any U.S. President would kind of attempt to call the bluff because of the risks. But as we’ve seen, that has now been done. And it wasn’t a bluff. They were able to successfully close the strait. But now going forward, they want to figure out a way to maintain that. I think that they will maintain a kind of a tight grip on flow and a limited, restricted kind of pressure building stance, as we kind of currently see, as long as the threat of war continues. I think what Iran’s trying to find is some kind of way to get a guarantee that it won’t be bombed as soon. Because in a world ... let’s say Iran just opens the strait, right? Right?
Rory Johnston:
[32:26] They’re not being attacked. They open the strait and it’s basically oil prices come back down. The global economy heals over like two months. And then and then Israel and the United States just bomb them again. It would for them take them another month, six weeks or more to build back to this level of pressure in the system. So this is the moment they have the maximum leverage. And if with, Hormuz is the tool, I agree that, you know, after the war ends, they have an interest in normalizing, you know, at least maybe not the exact full pre-war levels, because again, you’ve also seen a lot of diversions. I think Saudi Arabia will continue shipping out the Red Sea just because of the kind of strategic kind of optionality it provides. But yeah, they’re going to want to, you know, reestablish ties with India. And again, part of these 10 points, one of the conditions is removing all sanctions, U.S., international, that have ever basically been imposed on Iran, which would allow Iran to, for instance, reestablish its natural trading relationship with India, which is which was used to be one of the largest importers of Iranian oil until the JCPOA was was scuttled and heavy blocking sanctions were imposed.
Robinson Meyer:
[33:34] That is a way I think that Iran want this to go, but it would want it to go that direction under kind of control of the IRGC and the strait. Then we end up in a situation where I guess that’s not a situation that prevents Iran from restarting its nuclear program. And it’s going to get a lot more money from these tolls as part of that process. I mean, a lot of estimates have kind of indicated that Iran could be earning under this type of arrangement as much money from tolls as it does from its entire oil trade.
Rory Johnston:
[34:00] That’s a lot of money. And the money buys a lot of missiles and nuclear enrichment program and everything else. I’ve been describing that situation as vastly preferable to the current status quo in terms of like the humanitarian cost that the current status quo will continue to rot if this continues. But it’s not an end. It is an interim unstable situation that is prone to blow up again. That if in February you had asked me, even as you were building up pressure in the Strait of Hormuz. I would have said that the probability of like an actual close of the Strait of Hormuz was so remote that I wasn’t even in like, it wasn’t even included in my major scenarios. Now going forward, Iran has a taste for closing the strait. It knows how effective it can be. That will be part of its strategic arsenal going forward in the same way that drones and missiles and proxies have been.
Robinson Meyer:
[34:54] And I think crucially, it was able to close the Strait of Hormuz without really a conventional Navy or a conventional air force in any kind of sense. It was able to close it basically with drones and missiles, which can be produced at scale, underground, or in covert locations, such that a lot of assumptions about the kind of firepower that Iran would need to close the strait proved wrong, in part because it was able to do it with these relatively mobile, in some cases, electric, in the case of drones, technologies.
Rory Johnston:
[35:25] I like the transition in there. That’s good. Let me just say that, while I have said that the current status quo is inherently unsustainable and, if it continues, will result in economic and human calamity, that is not to say it’s the worst the situation can get. Very concerning. And I think one of the things that makes this an even worse scenario, and we just discussed the scenario where Iran is allowed to open the strait under its control, and even though it’s geopolitically untenable.
Rory Johnston:
[35:54] You end up in a situation where the immediate kind of crisis maybe abates. There’s a situation where let’s say this weekend we we get to and you know i can’t keep track anymore of when the meetings are taking place or who’s delayed or whatever but initially they’re gonna be friday now they’re looking like they’re gonna be saturday these negotiations but let’s say those fail which again nothing has changed really about the two sides negotiating positions so i don’t know how they’re going to succeed so we will see again we hope they have i guess the one thing that’s changed is they have a better sense of the kind of mutually assured destruction They do. But on the flip side, like, let’s say two days ago, Trump had $110 June Brent futures. And on that same day that the ceasefire was announced, we had dated Brent crude or spot Brent crude in the North Sea had an all time high of more than $144 a barrel. So it was pretty, I think, serendipitous that yeah, yeah, not inflation adjusted. Yes, nominal nominal dollar barrel. But I mean, the fact that we printed an all time high price on the day that the ceasefire was announced, I think is indicative of the type of pressure the White House was facing, and now prices have fallen back. So there’s this classic paradox of every time Trump jawbones the market lower, it reduces pressure on the White House to reach the policy conclusion that the market was selling off on in the first place. And I think that same thing applies here. So I agree that the awareness of Iran’s capability has changed.
Rory Johnston:
[37:24] But Trump is still deeply in the mind that he can basically kind of, you know, zone of kind of, you know, bamboozlement, convince the market that this is all fine. And that’s honestly, he’s been very successful at this thus far. Futures continue to trade well, well, well, well, well below where the spot markets are trading. And most people in terms of establishing a political narrative and based on you can just read some of the replies to me on Twitter to kind of get a picture of this. They think that this is working. They think there’s no crisis in the oil market, because if there’s a crisis in the oil market, why is Brent below $100 today? June Brent. So I think that that’s been very successful. But let’s say that those fail, those talks fail this weekend.
Rory Johnston:
[38:03] And then we end up in a situation where we do start to get boots on the ground. We do, you know, the U.S. Does try and seize Kharg Island, the major staging island for most of Iran’s oil exports. Then you begin seeing a cascading series of facility attacks. And Iran’s been very clear and very transparent about its escalatory logic. And you saw this two, two and a half weeks ago when Israel struck the South Pars gas field in Iran, and Iran immediately retaliated by Iran.
Rory Johnston:
[38:34] Obliterating a large part of the LNG facility in Qatar at Raslofen. And that the Qatar Energy CEO was quoted by Reuters is saying, reduced Qatar’s LNG export capacity by 17% for up to five years. And I think right now we’re talking about that 13 million barrels a day of production that shut in through the Gulf. I’m modeling that right now as recovering over a period of weeks to months, kind of 70% recovery over the first month and kind of trailing out after that. Pretty fast recovery rate. I think the market’s also seeing those same estimates and believing they can look through this, that it’s bad, but you can see the other side. If, say, you start having those same types of headlines where there’s a 20% reduction in Kuwaiti exports for five years.
Rory Johnston:
[39:26] Well, that’s something you don’t look through anymore. That’s basically eternity from the perspective of the spot market. So that’s when this gets worse. So I think that we’re trending right now towards some kind of middle ground that obviously the United States was not able to defeat Iran and reopen the strait on its own terms. This week, at least, we’ve reduced the odds of the truly calamitous boots on the ground spiraling, you know, facility attacks across the Gulf. And we’re kind of in this middle ground now, which is better, but still kind of unstable and prone to blow up. That I think is better, but we could have the situation coming out this weekend where things get much worse again. I think it’s ultimately in the hands of Trump.
Robinson Meyer:
[40:06] And what I’m hearing from you also is that the broader energy crisis here is not yet over.
Rory Johnston:
[40:11] No, I think, you know, at the very least, I had mentioned earlier, this is an air pocket that kind of travels to the system, depending on how far you are away from the Gulf. Basically, we’re not going to feel the last tanker from Hormuz hit the U.S. until probably early next week. But by the same token, it takes that long to refill, if you will, envisioning kind of refill the the pipeline on water that even if if ships started you know even if Hormuz was open today it would take weeks to clear the current backlog log of ships in the strait and you need other ships coming back in to the into the gulf which i’m not sure many people are going to be jumping over themselves to have the honor of being the first ship first non-iranian ship or say whatever that goes to refill um those are the situations that we need to kind of see re-established and that’s going to take months to do at kind of a minimum. So we’re, you know, even if this ends, maybe the peak is away from us, but we’re going to be bumpy and I could easily see a situation where let’s say oil prices sell off on the political headline of ceasefire.
Rory Johnston:
[41:15] Only to kind of grind higher thereafter as all of those pinch points are actually realized through the global system. And that’s kind of what I’m expecting to say.
Robinson Meyer:
[41:24] When that happens, we’ll have you back on the show. We’ll have to leave it there. Rory Johnston, it’s so good to talk, as always. Thank you so much for joining us. I know you have a very busy day. Thank you so much for having me, Rob.
Robinson Meyer:
[41:36] And that will do it for us in this episode and for this week. We’ll be back next week at the usual time with a new episode of Shift Key. If you love this episode, if you hated it, you can always let me know. You can find me on LinkedIn or Blue Sky or X, all at Robinson Meyer. Until then, Shift Key is a production of Heatmap News. Our editors are Jillian Goodman and Nico Lauricella. Multimedia editing and audio engineering is by Jacob Lambert and by Nick Woodbury, who both worked overtime to get this episode out today. So thank you so much to Jacob and Nick. Our music is by Adam Kromelow. Thanks so much for listening. Remember to stick around for a special message at the end of this show from our sponsor, Lunar Energy. Hi, my name is Mike Munsell, and I’m the Vice President of Partnerships with Heatmap.
Robinson Meyer:
[42:21] Last week on the show, I chatted with Lunar Energy’s Sam Wevers about the rise of distributed energy. And today, we dig into utilities and rate design.
Sam Wevers:
[42:30] My name is Sam Wevers, and I’m Director of Product at Lunar Energy.
Robinson Meyer:
[42:34] Let’s talk about policy. What does good policy look like for home solar and batteries?
Sam Wevers:
[42:40] It’s a very complex area, but if I picked a couple of themes, I’d say one is price signals, and the other is even playing fields.
Sam Wevers:
[42:48] So these technologies, you know, solar and batteries in particular, can bring a lot of value to homes and to the grid. But for that to happen, they really need price signals. that is, you know, electricity that costs different amounts at different times of day based on supply, demand, physical constraints in the market.
Sam Wevers:
[43:08] And when there are those price signals, batteries and the software that controls them can automatically charge or discharge to reduce customer load and customer costs at the exact time that the grid needs lower demand. And so it’s that kind of just almost automated response and load shaping that you can achieve. The other thing I mentioned was level playing fields. And this is really about ensuring that the rules that determine how homes and the assets in homes participate in the grid are really treating the different potential technologies that could participate on an even and sort of equivalent basis. That is to say not having market rules that assume that it’s a big gas peaker plant is the only thing that can participate in a service but getting into the weeds of performance and telemetry requirements that are appropriate minimum megawatt clip sizes that are appropriate those sorts of things are really important to make sure that all these tens and tens of thousands of residential assets and millions of assets that get deployed they can not only provide savings and resilience to customers, but they can provide services on the distribution grid or play in wholesale power markets.
Mike Munsell:
[44:20] There’s often this tension between distributed energy and utilities, but is there a win-win solution for both utilities and for homeowners?
Sam Wevers:
[44:28] Oh, absolutely. I mean, this is really core to our sort of philosophy of how power markets should be here at Luna. It’s very easy to focus on one side of the ledger when you look at a home battery to say, I’m going to use this battery to provide bill savings to the customer, or I’m going to use this battery to provide grid services into the utility.
Sam Wevers:
[44:50] But our view is very much that if you’re not considering things holistically, if you’re not co-optimizing, as we say, between bill savings and the potential value out in the market, then you’re leaving value on the table. It’s like having an amazing vintage car and sort of leaving it parked in your driveway. And so we’ve built a software platform that can actively co-optimize for multiple objectives at the same time, like customer bills and VPP revenue, to sort of grow the pie as much as possible. And once you grow that pie, then you can make commercial decisions about how it gets sliced up and shared around. But certainly, if utilities want to get access to fast, reliable flexibility that is not only available in bulk, but also available at very discrete points in the network where they might need help with some distribution constraints, then we have to make it a win-win for utilities and homeowners.
Sam Wevers:
[45:43] The other thing that is probably worth flagging here, though, in terms of the relationship between sort of utility objectives and homeowner objectives, and I touched on it briefly before when I was talking about price signals, there’s a really important relationship between rate design and VPP programs. And we talk about this sometimes as implicit flexibility, which is flexibility that emerges because of a price signal, and explicit flexibility, which is flexibility that comes because somebody has a VPP contract. And it’s really important to consider those things holistically, because if you don’t, then you can essentially have assets responding to price signals or rate plans in a way that is maybe counterintuitive or at odds with the goals of a VPP program in that area. And so it’s really important to sort of, when we think of market design, to think of both sides of the coin there when thinking about rate design and VPP program design.
Mike Munsell:
[46:39] And can you talk about how Lunar is working with utilities today?
Sam Wevers:
[46:43] Yeah, so we’re delivering meaningful power into the grid is the first point to note, right? So we’ve delivered over nine gigawatt hours of residential flexibility into the American power grid over the past few years, dispatching VPPs made up of various OEMs devices on behalf of our clients. And that’s enough energy to power San Francisco homes for two days, as an example. So this is real grid scale stuff. We worked with PG&E and with Sunrun on a project called SAVE, which was really interesting, where we took hundreds of residential third-party ESS that we then grouped under various substations and essentially provided very temporally and locationally specific grid services per substation on a day-by-day basis, which is really exciting because it shows the sorts of value that these assets can bring to the power grid. We are also, with our software, GridShare, delivering DERMs, or distributed energy resource management services, to multiple community choice aggregators here in California, helping them shape their customers’ load curve in order to reduce the amount of resource adequacy that they need to buy in the market. But on the more sort of policy side, you know, we are actively engaging with regulators, both directly and through industry bodies like CALSA. And I’d say that just overall, you know, we are well aware that different regulatory models will emerge for different, you know, political and economic contexts.
Sam Wevers:
[48:07] With our grid share platform, we’ve delivered services in, I mean, easily over 20, 25 jurisdictions around the world. So we’ve seen how markets can be formed and shaped. and we essentially see our role as providing insights from our experience in those different markets to help inform policy choices and then once those policy decisions have been made to essentially maximize the value of those residential assets for homes and the grid in that particular market context.
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On copper prices, nuclear’s jellyfish woes, and Leo DiCaprio’s Chilean NIMBYism
Current conditions: The death toll from Colombia’s earthquake has risen beyond 250 • A severe thunderstorm flipped a car in Columbus, Ohio, as a large system swept across the Midwest • A partial solar eclipse is set to occur the Northeast.

David Crowley, a moderate Democrat and local official in Milwaukee, narrowly defeated Francesca Hong, a leftist state lawmaker and former ramen chef, in the Democratic gubernatorial primary in Wisconsin last night. The race marked one of the most significant tests of Democratic voters’ willingness to elect a member of the ascendant Democratic Socialists of America, now the most popular socialist group in U.S. history. Her campaign promised to make childcare and school lunches free, repeal anti-union laws, and give renters more protections against eviction. She also pitched what she called her “control-alt-delete” plan to eliminate tax credits for data centers and put a statewide moratorium on permits for new artificial intelligence facilities.
Ahead of Tuesday’s primary, the AI developers Vantage, Oracle, and OpenAI announced a $60,000 community investment in Port Washington, which my colleague Jael Holzman described as “the most controversial data center development area in the state.”
Just last week, the Trump administration agreed to pay the energy giant RWE more than $1.2 billion to abandon an offshore wind project, the latest in a series of deals in which taxpayers hand over billions to not receive new sources of clean electricity they badly need. On Tuesday, Senators Alex Padilla, the California Democrat, and Angus King, the independent from Maine, introduced a bill that would give companies that reject Trump’s payouts an expedited route to more development. “The Trump Administration is doing everything it can to kill California’s offshore wind future, handing energy companies billions of taxpayer dollars to walk away from projects that would have powered millions of homes,” Padilla said in a press release. “This bill makes sure their destructive approach doesn’t waste what’s already been invested so we can get these leases back to work, create the jobs Trump killed, and keep energy bills low for working families instead of letting his war on renewables cost Californians even more.”
The bill has one potential flaw, other than the fact that Republicans are unlikely to pass it and President Donald Trump is even less likely to sign it. That, as my colleague Robinson Meyer wrote this week, is that the roughly $4 billion in payouts so far went to projects that were “already dead or dying.” The money spent, in other words, is “for nothing.”
Please read the following two sentences in the tone of the famous scene of Tony Soprano defending Christopher Columbus: In this newsletter, Ea-nāṣir, the Mesopotamian copper merchant from Bronze Age-era Ur whose stone-carved complaints about a subpar metal shipment remain readable millennia later, is a hero. End of story! Why, you might ask? Because we are once again living through an age where copper, the basic building block of all things electric, is in high demand. Copper soared back to within half a cent of its record high Tuesday of nearly $14,000 per metric ton after an outage at a major smelter in Indonesia rattled global prices, Mining.com reported.
The fight over North America’s only major cobalt refinery, meanwhile, is heating up. The mining giant Glencore made a bid for control of Sherritt International, which has taken a beating from U.S. sanctions due to its 50% stake in Moa, a joint venture with the Cuban government. The joint venture’s assets include the Canadian refinery and Moa nickel-cobalt mine in Cuba. The Glencore-backed consortium is up against Gillon Capital, the family office of Ray Washburne, a Republican fundraiser and former Trump official, according to the Financial Times.
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Weeks after Europe’s latest heat wave forced inland nuclear stations to pare down output for lack of cooling water in the continent’s rivers, a “massive influx” of jellyfish has forced France’s EDF to shut down three units at its Gravelines nuclear station and cut power from a fourth. That’s taken at least 3.2 gigawatts of capacity offline, Bloomberg reported, right as temperatures are expected to surpass 104 degrees Fahrenheit in the coming days. The unusually hot temperatures off France’s shores have encouraged jellyfish populations to “bloom,” clogging the pumping stations through which coastal nuclear plants like Gravelines pull in cooling water.
In Egypt, meanwhile, construction crews working on the country’s first nuclear station hit a critical milestone. The containment vessel for the Russian-designed El Dabaa plant’s first unit is nearly completed, according to World Nuclear News.
Digging deep enough into the bedrock around New York City to tap into lava-hot rocks for electricity production is probably still years away, despite the progress that next-generation geothermal companies such as Fervo Energy have recently made. But thermal networks that maintain a steady environment year-round by circulating air at a constant temperature are increasingly popular ways for New Yorkers in private homes outside the city to stay warm in winter and cool in summer. Now the city itself is seeing whether a large-scale version could work for the subway system and municipal buildings. A study is set to begin soon into whether a thermal energy network could be built along subway routes to capture, store, and redirect excess heat that accumulates in the Brooklyn Bridge-City Hall and Chambers Street station complex to municipal buildings above ground. “Radiant cooling technology will absorb heat from the subway platforms and transfer it to geothermal boreholes drilled beneath Chambers Street,” reporter Carlo Cariaga wrote for Think Geo Energy. “This excess heat will then be stored underground until it can be used for supply to nearby municipal buildings during winter.” The contract for the feasibility study is due to be awarded in the fall, with work scheduled to start in early 2027.
“It seems like it’s a good place to test geothermal solutions because it sounds like there is a part of the tracks that isn’t being used, so they don’t have to stop service,” Jack Klein, the citizen researcher who conducted his own gonzo Subway heat study last year, told my colleague Jeva Lange this week.
Leonardo DiCaprio has long been a major donor to environmental causes. But rarely has the actor taken as clear a stance against green development if it comes at any ecological cost as this. On Tuesday, Bloomberg reported that the Oscar winner had told his nearly 60 million Instagram followers that fewer than 1,000 Pehuenche spiny-chest frogs remain in the wild, and that construction of the proposed Chile-Argentina transmission line threatens the amphibians’ habitat. “Conservationists are not asking for the transmission project to be stopped,” the celebrity wrote in the post over the weekend. “They are asking for it to be built where it does not put a Critically Endangered species at even greater risk.”
Rob checks in on this season’s supercharged ocean temperatures with climate researcher Zeke Hausfather.
Every few years, the Pacific Ocean’s surface waters become especially warm near the equator, a climatic phenomenon known as El Niño.
El Niño is a normal part of the climate system, but even in a normal year, it can trigger extreme weather around the world. Forecasters are worried that the current El Niño — which just began a few weeks ago — is going to be anything but normal. Models suggest that we could soon see the hottest El Niño ever measured, with unpredictable and catastrophic effects for ecosystems and societies around the world.
What does that mean? And why does this El Niño look so bad? On this episode of Shift Key, Rob is joined by Zeke Hausfather, a climate research lead at Stripe and a research scientist at Berkeley Earth. They discuss what forecast models are saying about this El Niño, why it gives us a glance at the future, and whether climate change itself is accelerating.
Shift Key is hosted by Robinson Meyer, the founding executive editor of Heatmap News.
Subscribe to “Shift Key” and find this episode on Apple Podcasts, Spotify, Amazon, or wherever you get your podcasts.
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Here is an excerpt from their conversation:
Robinson Meyer: How much, at this point, are we in an El Niño that is record-breaking? Like, how much do we see in observations, physical observations of the ocean or the atmosphere and the rest of the climate system, and how much do we think from the models that it is going to get even hotter?
Zeke Hausfather: So the way that we track the strength of an El Niño — there’s a few different ways to track it. But the most common one is from this particular region of the tropical Pacific called the Niño 3.4 region, which is sort of like about a third of the way into the Pacific off the coast of Chile, right around the equator. And that’s where this tongue of warm water forms during El Niño events. That’s sort of the characteristic signal of El Niños. And temperatures in that region, as of today, are at 2.8 degrees centigrade above normal, normal meaning the average of the last 30 years. So it’s sort of a sliding window that tries to remove some of the human-caused warming.
Robinson Meyer: Are we comparing temperatures from that region to another region? Or they’re just in that region two or more degrees above normal?
Zeke Hausfather: So it’s a good question. The traditional way that El Niño has been defined is to just compare that region to itself, but with a 30-year moving average applied to remove the effects of human-caused warming. There is another metric that was introduced by NOAA last year called the Relative El Niño Index, which is a variant where you sort of subtract out the average over the tropical ocean as a whole from that region, so you’re looking at the difference between that region and the rest of the tropics.
There’s pros and cons of that approach. Arguably, it removes the human warming signal a bit better, but it also can overly penalize really strong El Niño events that reach outside of that region because they start warming the whole tropics. So anyway, the details are technical, but the point on the observations is that we’re already seeing a very strong event occurring there today. You know, temperatures as of today, when we’re recording, August 10, are 2.8C above normal. To put that in perspective, the strongest ever anomalies we’ve recorded, at least daily in the satellite record since the 1980 or so, were in 2015, 2016, and those were about 3.1 degrees above normal. And so as of today, by itself, it would be the third strongest El Niño signal ever recorded in that region.
But what’s different is that El Niño almost always peaks near the end of the year. So if you look at all the El Niño events on record, there’s been one or two that have peaked in October, but the vast majority peak in November or December, and a couple as late as January. It’s a very persistent pattern of these events. And so the fact that it’s only the beginning of August now and we’re already at this extremely high level, we’re essentially running two to three months ahead of any other El Niño on record in terms of how quickly it’s developing, which is one of the reasons why we’re increasingly convinced that this is going to be a record-setting event. It’s going to blow any event we’ve seen previously out of the water. And if you look at the latest models that came out this morning, actually, it’s good timing. They’re predicting a peak of around 4C in the Niño 3.4 region, which will be, you know, more than a degree above the previous record and could end up being the strongest El Niño in 500 or 1,000 years. We don’t have great proxy estimates going back, but, it certainly is something well outside of anything we’ve seen since records began in 1850.
Robinson Meyer: The swimmer Katie Ledecky swims a race sometimes in the Olympics and she’ll be out swimming and then behind her there’s a computer-generated line which is the current world record, and she’s way out in front of the current world record, and you’re watching her and then she does she turns around in the pool and then the world record is behind her. That is the current El Niño. This is the Katie Ledecky-style El Niño.
You can find a full transcript of the episode here.
Mentioned:
NOAA’s El Niño page and the relative El Niño index
An Assessment of Earth's Climate Sensitivity Using Multiple Lines of Evidence, the 2020 paper where Zeke was a coauthor
Zeke’s blog post on AI emissions: The real energy use of agentic AI
John Bistline’s post on AI emissions at Watershed
Heatmap’s coverage of AI emissions: A New Guesstimate for Corporate AI Emissions
This episode of Shift Key is sponsored by ...
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Music for Shift Key is by Adam Kromelow.
This transcript has been automatically generated.
Subscribe to “Shift Key” and find this episode on Apple Podcasts, Spotify, Amazon, or wherever you get your podcasts.
You can also add the show’s RSS feed to your podcast app to follow us directly.
Robinson Meyer:
Hello, it’s Wednesday, August 12, and the Pacific Ocean is officially in El Niño. According to the National Oceanic and Atmospheric Administration, sea surface temperatures in the key region of the Pacific are now above average, and the agency expects they’ll remain that way through early spring 2027. Now, even a normal El Niño can be a big deal. They can cause very wet winters in California, huge rainfall events in South America, and droughts or even famines in parts of Africa and Asia.
Robinson Meyer:
But if you’ve been paying attention, you know that this El Niño seems like it’s not going to be normal. It seems like it will be a super El Niño. Forecasters are now warning we could see the largest El Niño in years or decades, if not in a century or more. The last time we had a super El Niño event in 2015 and 2016, it caused almost $4 trillion in global economic damages. This one now seems like it could be even bigger. So I wanted to learn more about what might be coming down the pike, why we think this El Niño, even though it hasn’t happened yet, or has only just begun, could be so big and what it could all mean. And we have a great guest. Zeke Hausfather is a climate research lead at Stripe and a research scientist at Berkeley Earth. He’s also an IPCC author. He’s a climate scientist with a strong interest in observational temperature records, climate modeling, mitigation and emission scenarios, and carbon removal. He’s kind of working on all sides of the climate problem at the same time, which is why I always enjoy talking to him. And I can’t believe we’ve never had him on Shift Key before. On this show, we talk about why we think this El Niño will be so big, why it will be a kind of preview of sorts of the climate of the 2030s, and whether climate change now seems to be accelerating and getting worse. I’m Robinson Meyer, the founding executive editor of Heatmap News, and it’s all coming up on Shift Key. Zeke Hausfather, welcome to Shift Key.
Zeke Hausfather:
Thanks, Rob. Great to be on.
Robinson Meyer:
One reason I always enjoy talking to you is because you’re at this nexus of, let’s say, climate science and the physical systems and physical processes that happen in the world and mitigation and carbon removal and decarbonization and the various processes we need to master to tackle climate change. You’ve been tracking recently a particularly worrying set of developments around this year’s El Niño. And I think over the past few weeks, it’s gone from something watching you write and share what the models are saying, what we can know about the coming El Niño, has gone from making me think that it was, oh, that’s kind of interesting to, wow, this is a massive story that’s unfolding in front of us that’s going to shape this. Not only the next year of how we talk about weather and climate, but really the coming year of global events. So I want to just start by asking you, what do we know about this year’s coming Monster El Niño, as it has recently been described? And how has it developed over the past few weeks and months?
Zeke Hausfather:
Yeah, so it’s funny you call it a Monster El Niño. We’ve traditionally said super El Niño but this is going to be so far beyond a super El Niño if the models are right that we sort of need a new term for it i prefer monster to godzilla El Niño which is the other one thrown around but in terms of this year’s El Niño so we knew an El Niño was coming by late 2025 but we didn’t know how strong and so there’s a set of different dynamical models this year some of them are actual climate models some of them are you know more simple sort of adapted weather models But there’s about 14 or so different groups around the world that publish these sort of dynamical models of El Niño behavior. And so we knew that there was something in the pipeline. But at least initially, you know, circa January, February, it looked like it would be a pretty moderate event, you know, something maybe akin to... What we saw in 2010 may be enough by itself to drive a record warm year. And we’ll talk about the relationship later between El Niño and global temperatures, but not something that would be record setting by any stretch of the imagination. But by April or so of this year, we really started getting a big shift in the models. Back then, they showed something that could potentially tie 2015-2016 as the strongest El Niño event on record. Actually tie both 2015-2016 and the sort of storied El Niño of 1877-1878,
Zeke Hausfather:
Which is a particularly disastrous event in the early part of the record. But with every month that has come since, the models have been projecting higher and higher and higher estimates for this El Niño event. And the observations have been consistently overshooting what the models previously had projected. So, it’s not just the models that are going up, the observations are also skyrocketing and leaving the previous model projections in the dust. And there’s this thing in El Niño forecasting called the spring predictability barrier, which essentially is the fact that we’re just not very accurate at predicting El Niño during the spring. And so for a while there, everyone was kind of debating, like, is this another, you know, because there have been some historical cases where particularly individual models have gotten things really wrong in the spring. They’ve said the super strong El Niño event is coming, and it never came for one reason or another. The westerly wind bursts didn’t happen, or there’s changing patterns of circulation that led to the El Niño not developing. But now we’re well out of the spring predictability barrier, right? And we’ve seen observations already go into record territories. In fact, as of today, we are currently in the third strongest El Niño event ever recorded, maybe fourth if you go back to the 1800s.
Robinson Meyer:
Well, this actually gets to a key follow-up, which is how much at this point are we in an El Niño that is record-breaking? Like how much do we see in observations, physical observations of the ocean or the atmosphere and the rest of the climate system? And how much do we think from the models that it is going to get even hotter?
Zeke Hausfather:
So the way that we track the strength of an El Niño, there’s a few different ways to track it. But the most common one is from this particular region of the tropical Pacific called the Nino 3.4 region, which is sort of like about a third of the way into the Pacific off the coast of Chile, right around the equator. And that’s where this sort of tongue of warm water forms during El Niño events. That’s sort of the characteristic signal of El Niños. And temperatures in that region, as of today, are at 2.8 degrees centigrade above normal, normal meaning the average of the last 30 years. So it’s sort of a sliding window that tries to remove some of the human-caused warming.
Robinson Meyer:
Are we comparing temperatures from that region to another region, or they’re just in that region two or more degrees above normal?
Zeke Hausfather:
So it’s a good question. The traditional way that El Niño has been defined is to just compare that region to itself, but with a sort of 30-year moving average applied to remove the effects of human-caused warming. There is another metric that was introduced by NOAA last year called the relative El Niño index, which is a variant where you sort of subtract out the average over the tropical ocean as a whole from that region. So you’re sort of looking at the difference between that region and the rest of the tropics. There’s pros and cons of that approach. Arguably, it removes the human warming signal a bit better, but it also can overly penalize really strong El Niño events. That reach outside of that region because they start warming the whole tropics. So anyway, the details are technical, but the point on the observations is that we’re already seeing a very strong event occurring there today. You know, temperatures as of today, when we’re recording, August 10, are 2.8C above normal. To put that in perspective, the strongest ever anomalies we’ve recorded, at least daily in the satellite record since the 1980 or so, were in 2015, 2016 …
Zeke Hausfather:
And those were about 3.1 degrees above normal. And so as of today, by itself, it would be the third strongest El Niño signal ever recorded in that region. But what’s different is that El Niño almost always peaks near the end of the year. So if you look at all the El Niño events on record, you know, there’s been one or two that have peaked in October, but the vast majority peak in November or December and a couple as late as January. You know, it’s a very persistent pattern of these events. And so the fact that it’s only the beginning of August now and we’re already at this extremely high level, we’re essentially running two to three months ahead of any other El Niño on record in terms of how quickly it’s developing. Which is one of the reasons why we’re increasingly convinced that this is going to be a record setting event. It’s going to blow, you know, any event we’ve seen previously out of the water. And if you look at the latest models that came out this morning, actually, it’s good timing. They’re predicting a peak of around 4C in the Niño 3.4 region, which will be, you know, more than a degree above the previous record and could end up being the strongest El Niño in, you know, 500 or a thousand years. We don’t have great proxy estimates going back, but, you know, it certainly is something well outside of anything we’ve seen since records began in 1850.
Robinson Meyer:
The swimmer Katie Ledecky swims a race sometimes in the Olympics and she’ll be out swimming and then behind her there’s like a there’s a computer generated line which is the current world record and she’s way out in front of the current world record and you’re watching her and then she does she turns around in the pool and then the world record is behind her that is the current El Niño this is the Katie Ledecky style El Niño. This seems like as good a juncture as any to ask what physically is an El Niño? We talk about it as an event. We talk about it as a kind of phenomenon that can develop within the global climate system. I think people know that it has to do with the temperature of the Pacific, but what actually is physically happening on the planet when an El Niño occurs?
Zeke Hausfather:
So El Niño is a natural phenomenon. There is arguably some contribution of climate change to El Niño intensity and frequency, but it’s a topic that’s pretty heavily debated and we can talk about that in more detail later. But El Niño itself happens every three to seven years. It’s got a sister event called La Nina, which is essentially the inverse of it, which is unusually cold temperatures in the tropical Pacific instead of warm temperatures. And El Niño is driven by a combination of wind and currents. You have what we call westerly wind bursts that are changing the ocean mixing behavior in the Pacific. And so during an El Niño event, effectively the ocean takes up less heat, and so the atmosphere ends up being warmer, or the ocean even releases some heat. During La Niña, which is the inverse, the ocean, the deeper ocean, I should say, takes up more heat, And so the surface is cool. And so interestingly enough, during strong El Niño events, you tend to have a smaller increase or even in some extreme cases, a loss of ocean heat content, whereas the surface temperatures where we all live end up being much warmer. And so, you know, this isn’t necessarily something that is being caused by humans, but it’s happening on top of human driven warming. And a lot of the year to year variability in global temperatures, which many folks are familiar with looking at, are driven by the sort of El Niño-La Niña cycle.
Robinson Meyer:
What is driving this shift within the model? If the models believe that it’s going to be very warm, then it seems like there are probably signals within the physical system that are pushing them to believe the sea surface will get even hotter than it is right now. And so what are those signals that they seem to be responding to as we understand them?
Zeke Hausfather:
So there’s a couple factors going on here, right? One is, as I mentioned earlier, observations are persistently running above what previous model runs predicted. So observations themselves of the El Niño region sea surface temperatures are persistently running above. Driving projections for a strong event. But we are not just measuring sea surface temperatures. We are also measuring meteorological conditions that are favorable to the sort of westerly wind bursts that drive growing El Niño strength. And we’re modeling and observing what’s happening in the ocean below the surface. And so there we see this sort of pulse of warm water coming from the Western Pacific into the Eastern Pacific and moving up toward the surface. And that warm water is quite warm. You know, some regions are nine degrees centigrade above normal in sort of the deeper ocean temperatures. And that’ll emerge at the surface off the coast of Chile and then spread out across the El Niño tongue into the sort of eastern and central Pacific in the tropics. And so just seeing this warm water moving under the surface toward the El Niño region gives us a little sneak peek to, you know, what’s going to emerge in the next few weeks.
Robinson Meyer:
Because when you see the satellite imagery. That’s thermal coated of an El Niño, it looks like this big tongue of warm, I mean, you just called it the El Niño tongue, but it looks like this big, you know, stalactite of warm water is jutting out into the ocean, and then fading into the kind of baseline temperature mix. But it looks like this big warm tongue that I guess is aligned with the equator or just below the equator or?
Zeke Hausfather:
It’s right around the equator. Yeah. And I think tongue is generally the term that’s and used by folks. But under the surface, the sort of opposite is happening, right? So at the surface, it’s spreading out from the coast of Chile to the west. But under the surface, you have water moving eastward, like warm water in the deeper ocean. And then that’s coming up at the surface in Chile and then spreading westward. And so it’s almost a circulation you could think of it as.
Robinson Meyer:
Let’s bracket out what this El Niño might mean. But what does an El Niño generally mean for the rest of the world. I realize it has lots of these local effects, but one thing I’ve observed, and even reading about El Niño and covering El Niño, is it seems to be both understood as maybe the biggest annual variable in the climate system. And that means it’s both strongly described and also there’s a lack of specificity sometimes about what exactly it will do or what a large El Niño means as opposed to a small El Niño.
Zeke Hausfather:
So what we can most directly say is what’s happening in the tropical Pacific. You know, we’re measuring the sea surface temperatures. There’s that tongue that is very visible. It stands like a sore thumb in any global temperature map during an El Niño event. But when you shift temperatures in the ocean, in the tropical Pacific, it has a whole bunch of teleconnections to the rest of the planetary climate. It’s going to move the jet stream around, it’s going to lead to changing precipitation patterns. And again, some of these are more deterministic than others.
Zeke Hausfather:
It increases the odds of things. It doesn’t necessarily always cause things. But the things that we do tend to see most often associated with El Niño events are or in the El Niño tongue itself,
Zeke Hausfather:
And directly around it, things get a lot wetter. So coastal Peru and Ecuador see a huge amount of rainfall, the Horn of Africa. There’s a few other areas that tend to get quite a bit wetter. But, and in some ways more importantly, the area around that tongue to the north and the south of it and to the west of it get a lot drier. And this is probably the single biggest and most problematic impact of El Niño is its effects on rainfall in those regions. So places like Indonesia and Southeast Asia, India, Southern Africa, Northern Amazon, Eastern Australia, they all tend to get quite a bit drier during El Niño events. And if you look at some of the bigger El Niño related catastrophes in history, like the,
Zeke Hausfather:
You know, mass deaths following the 1877-1878 El Niño event, when depending on what study you look at, somewhere between, you know, three and 50 million people died, that was largely due to crop failure associated with drought in those regions. So that’s the one I’d be most worried about. But, you know, there are also a bunch of other effects. So the western U.S. famously gets wetter during El Niño years. We tend to have mudslides here in California. Route 1 is probably going to get washed away more than usual. You know, we tend to have a bit warmer temperatures in the northern parts of the U.S. and northwest Canada. You know, the oceans as a whole get warmer. One thing that we’ve started seeing during El Niño events starting in 1997, 1987-1988 is these sort of globally widespread coral bleaching events. So the first time this was observed was in 97-98 during that El Niño event. And it’s since then become sort of a common occurrence every time we have a strong El Niño and even some summers when we don’t because the oceans have
Senator Martin Heinrich:
Gotten so hot.
Zeke Hausfather:
And so certainly this year, that’s something that a lot of people are concerned about in the winter in the tropics. There’s also a bunch of different effects on storms associated with changes in wind shear and circulation patterns. A very strong El Niño event will suppress Atlantic hurricanes. It’s one of the reasons that our forecast for Atlantic hurricanes has been cut in half already and might be cut significantly further. But it does tend to lead to more cyclones in the eastern Pacific. So cyclones that might hit Japan or Hawaii or China are going to become more common this year. And then globally, it tends to warm the climate as a whole. So a strong El Niño event tends to be associated with a boost in global temperatures of up to 0.4C for four or five months, and for the year as a whole of around 0.2C. Though this event, because it’s so unprecedented, might push it much further than that. There’s also a bit of a lag in time between when El Niño peaks in the tropical Pacific and when the global temperature effects have felt of about three to five months. So that’s one of the reasons why, even though El Niño is going to peak this year, it’s next year, 2027, that’s likely to be the record shattering one in terms of global temperatures. And that’s a pattern that we persistently see in, you know, 1997 was warm and 1998 was record shattering. 2015 was warm and 2016 was record shattering. It’s the year after El Niño peaks that we really see this big boost in temperatures.
Robinson Meyer:
And that’s because basically we’ve added all this anthropogenic CO2 to the atmosphere. We already know the Earth is kind of out of temperature balance where there’s more heat captured in the atmospheric system than there would be in a kind of a thermostatic way. And normally how that’s dealt with is that heat gets dumped into the ocean and water goes down to the ocean, the ocean acts as a kind of planetary sink for heat from the atmosphere. Exactly. And if the ocean everywhere is unusually warm, but also if the world’s largest ocean is really, really warm at its warmest point, with heat radiating outward from there into the rest of the marine system, then it stops absorbing heat.
Zeke Hausfather:
If the ocean is absorbing less heat, which is sort of the major effect of El Niño, or even releasing heat in some extreme cases, that’s going to lead to a much hotter atmosphere. And so if we didn’t have El Niño and La Nina, almost every year would set a new record in a warming world. It would be monotonic, as we say. The line would just go up. But because we have El Niño and La Nina on top of that, some years are a bit cooler, some years are a bit warmer. And so you can even think of it as like a sine wave driven by El Niño and La Nina cycles on top of an upward line.
Robinson Meyer:
You referenced the 1877-1878 event. You referenced that this could be the biggest El Niño in 500 or 1,000 years. How do we know about El Niño events before the satellite record begins in let’s say around 1980 or even before I think modern 1877, 1878 is within the realm of modern temperature reconstructions where we take land records and put them together and some ocean records and put them together and then simulate the Earth’s climate and get a decent sense of what was happening in the climate system. But how do we know about these historical events?
Zeke Hausfather:
Yeah. So there’s, for a record like 1877, 1878, there’s sort of two ways we know about it. One is that we did have a decent amount of ocean measurements that far back. And so at least on trade routes, the sailing ships were throwing buckets over the side of the ship and pulling them up with a rope and sticking a thermometer in them. So we have some measurements in the El Niño region during that event. Not very many. So there still is a pretty big uncertainty there. But we also have a reasonable estimate of global temperatures. And so you can sort of back out to an extent the strength of an El Niño from its effect on global temperatures as well. And then when you go before 1850, we don’t really have any observations. I mean, there’s some land observations, but there’s not much in the way of ocean observations. And so there you’re relying on some individual proxy measurements like corals that can tell you something about temperature at a particular time. And you’re also looking at these overall global temperature reconstructions and trying to back out the strength of an El Niño event based on, you know, how spiky global temperature is. But certainly the further you go back, the lower the resolution those things are. So like 500 years, we can probably get at least a fuzzy picture.
Zeke Hausfather:
You know, a thousand years, you’re starting to push it just because it’s hard to pick up an event that’s only a year in duration in those proxy records that might have a resolution of 10 years or 15 years. And then obviously, if you push, well, before 1,000 years, you know, you’re starting to get into the realm of a single proxy observation is going to tell you something about 50 or 100 year average. And at that point, El Niño is just going to wash out. So it does limit the extent to which we can say something about the El Niño record.
Robinson Meyer:
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Robinson Meyer:
It’s interesting because to me the 2015-2016 event was right around the same time i started covering climate change and i think it actually marked a big moment in climate discourse if i’m allowed to historicize off the top of my head about these things december 2015 which is i really right as that El Niño event was peaking was the same month the paris agreement was signed obama had just issued and was about to fight in the courts for greenhouse gas regulations on power plants under the Clean Air Act. Then, of course, we had the 2016 election, of which a large amount of the content was about climate change. And I think an underrated amount of that election was about climate policy. And then we had the first Trump administration, during which climate became a more and more salient topic politically. And so 2015, 2016, that El Niño, the earth has had most of the warmest years on record have actually happened since that El Niño. That is still the decisive event to me. And I still remember, for instance, those mass coral bleaching events of the 2015-2016 period.
Robinson Meyer:
What do we know, if anything, about El Niño now that we didn’t know 10 years ago during that event? Or what do we know about El Niño’s relationship to climate change, if anything, that we didn’t know for the 2015-2016 event?
Zeke Hausfather:
Before I answer that, I’ll answer another related question, which I think is like why these sort of events have such salience in the public discourse. And I think, you know, part of that is that climate is a slow and gradual problem and our politics are not designed around slow and gradual problems. And so when we do have these acute events, which El Niño on top of global warming represents, you know, it’s a big spike upward. It gives us a sneak peek of, you know, what the new normal global temperature condition is going to be in a decade or so. You know, it tends to focus the attention. And so I think it is important for us to use that to the extent we can, because it is a little sneak peek of what’s coming soon. But in terms of the question you asked around what we know in addition about El Niño and climate, so there certainly have been a number of papers suggesting that climate change could be making strong El Niño events more common. There’s some physical mechanisms that have been proposed, but it isn’t something that shows up particularly robustly in our climate models today. And there are a number of scientists who also argue that there’s those physical reasons that have been proposed are not super strong. So I’d put this in the same category as the debates around like wavy jet stream from global warming and its effects on cold air outbreaks, for example.
Robinson Meyer:
And the way we jet stream, just for listeners, is the idea that climate change is making those extreme cold snaps that we have had recently in North American winters where it’s suddenly negative 10 for a day or two more common because the jet stream is less stable and it dips down, allowing the so-called polar vortex to dip down over more populous parts of North America than where it normally lives.
Zeke Hausfather:
I’d put both of those ideas in this category of very active scientific debate, like the jury is out. And so hopefully in another decade, we’ll have a stronger answer in both of them and more modeling and observations. But I don’t think we can say today that there’s particularly strong evidence that climate change is going to make El Niño’s stronger outside, of course, of, you know, the background warming, just making the impacts of everything worse.
Robinson Meyer:
Right. It’s so funny. I mean, it’s one of those classic climate science discussions where it would be great to know it would be an interesting answer that we’d learn about the Earth climate system. But it wouldn’t really, I don’t know that it would have policy relevance as maybe it would. I mean, maybe we’ll learn about key El Niño mechanisms that could come important later. But the key takeaway of climate science is and remains that we should, you know, reduce anthropogenic greenhouse gas emissions as fast as we possibly can while avoiding overall harms to humanity.
Zeke Hausfather:
And the climate impacts of human emissions are just so much bigger over time than the climate impacts of El Niño, right? You know, a strong El Niño event will add about 0.2 degrees centigrade to global temperatures for a year. You know, human emissions are adding that every eight years. So every eight years, we’re adding a permanent Super El Niño worth of heat to the climate system, which just helps put things in perspective. Or 1998, which at the time was a record-shattering year, would be an exceptionally cool year if it occurred this year.
Robinson Meyer:
Given the monotonic increases of human greenhouse gas emissions every year, at least so far, what does this El Niño event mean for global temperature rise? You’ve been involved in a debate with the, I would say, storied NASA, former NASA climate scientist Jim Hansen, about whether 2026 will be the hottest year ever. Maybe fill us in on that, but generally, what does this event mean for global temperature?
Zeke Hausfather:
Yeah. So El Niño provides a temporary boost in global temperatures. We know how it’s happened historically. It’s a little harder to predict this year because we’re so far out of sample. You know, if the models are right, we end up with a peak at 4C, which is more than a degree above anything we’ve ever seen before. We don’t have analogs to draw on. But if we assume the world is linear, which we get in trouble for sometimes, we would expect a boost in global temperatures in 2027 of, you know, 0.25, maybe even up to 0.3C. And so at least my latest estimate is that this year, 2026, will be pretty neck and neck with 2024. Probably still going to be the second warmest, but, you know, maybe a 40% chance it’s the warmest, 60% chance it’s the second warmest. So getting closer and closer to a coin toss. Next year, 2027, though, is going to shatter records. So the warmest year we’ve had to date was 2024, and that was about 1.5 degrees, 1.5, 2 or so above pre-industrial levels across the average of six different data sets that the scientists have put together. 2027 in those same data sets, given what the models expect El Niño to do, would end up around 1.7 degrees C.
Zeke Hausfather:
So even compared to the previous El Niño event, which was a big boost, you know, this event is going to shatter records. And so the air bars are still pretty big on that, in part because, you know, the models have a wide range of projections. If it ends up being an El Niño that only breaks a record by a small margin instead of shattering it, the global temperature response is going to be smaller. But under any of the El Niño forecasts, 2027 is going to be a record warm year. I think the last time I checked, there was about a 95% chance it sets a new record.
Robinson Meyer:
One of the multi-year running conversations in climate science, and I would say among climate analysts as well, is that this year, as you said, temperatures will be on average about 1.5C warmer than their pre-industrial average. I believe last year we were over 1.5C as well, or very close. And one way I’ve tried to be rigorous as this has happened in the climate system is to say, look, like just because you have one year, you know, of course, at this point, about eight or nine years ago, the IPCC came out with its 1.5C report, which basically said the effects of climate change at making the planet a degree and a half warmer than their pre-industrial average will be more severe than we thought will be bad. Well, it’s a thing that’s worth avoiding. One thing I’ve been carefully rigorous about is like a single year where the global average temperature is more than 1.5C above pre-industrial average doesn’t actually mean we’ve cleared this sort of conceptual 1.5C threshold. I mean, to be clear, we are definitely going to clear the 1.5C threshold, but the first year you do it is not when you actually clear that threshold. You need several years of data above 1.5C to bring the five or 10-year moving average above 1.5. It seems like with this big El Niño, though,
Robinson Meyer:
We are going to have warm temperatures. We’re going to really push that moving average a fair amount and at least could temporarily get the threshold to be pretty close. I realize it’s hard to predict more than beyond 2027. We don’t know what 2028. We could have a big La Nina in 2028 and it could push temperatures back down below 1.5C. But maybe to tie this into another conversation. I think for the past four years or five years at this point, really since the pandemic, global warming has appeared to accelerate. And there’s been this question about whether it was caused by reductions in particulate pollution or whether it’s some other process that’s being revealed as human emissions continue to drive it. I guess the other takeaway from this big El Niño event is like that acceleration is going to continue given that we’re going to be above 1.5C this year and we could be above 1.6 or 1.7 next year.
Zeke Hausfather:
Certainly, our estimates of when the world is going to cross 1.5C have been moving closer and closer to present. One of the challenges, I think there is broad agreement now that global warming is accelerating. In fact, I went out on a bit of a limb in 2023 and published a piece in the New York Times arguing that it was accelerating back when the evidence was much more mixed than it is right now. I think the debate is less today about is it accelerating and more about exactly how much and how quickly it is accelerating. And how much of that acceleration is being driven directly by human emissions, the combination of greenhouse gases that warm the planet and cutting emissions of aerosols, sulfur dioxide in particular, that have masked a portion of historical warming. And how much of it is being driven by feedbacks to the warming process, which in many ways are the more worrying factor, right? You know, is cloud changes that we’re observing, you know, all being driven by cutting air pollution and sulfur and shipping fuel and Chinese particulates from their coal plants? Or is that change in cloud behavior and clouds being less reflective a response to the warming itself? Because it turns out that the biggest driver of how sensitive climate models are to our emissions, this factor we call climate sensitivity, essentially how much warming you get if you double CO2.
Zeke Hausfather:
The biggest determinant of that in climate models is how clouds respond in a warming world. So if the cloud feedback is strong, if clouds become less reflective, if there’s less low-lying clouds, potentially more high clouds in a warming world, then you get a lot more warming for the same amount of CO2. And so we can’t say for sure today, what mix of factors we’re seeing. But I think a lot of us are really concerned that we might be seeing an emergence of a stronger cloud feedback, which would, all things being equal, tend to imply a higher climate sensitivity.
Zeke Hausfather:
But in terms of when we’re going to pass 1.5 degrees, unfortunately, the Paris Agreement didn’t actually define what they meant by 1.5 degrees, which has caused a lot of challenges after that. And then the IPCC decided to fill in the gap. And they said, OK, we’ll define 1.5 degrees as the midpoint of a 20-year period. So 20 years is long enough that El Niño and La Nina effects will cancel each other out, and you’ll just have the human warming, the long-term effects in there. The problem with that, of course, is that means you won’t know when you’ve passed 1.5 degrees until 10 years after the fact, which is not the most useful definition. So there’s a big paper in the works that myself and like 40 other people are co-authors of that hopefully is going to come out later this summer or fall that is trying to actually answer this question and say, how do we as a community figure out a way to define when we’ve crossed 1.5 degrees that doesn’t require waiting 10 years in the future to know? There’s still a bunch of different options you could choose and different methods and ways to combine observations and models or statistical smoothing or linear or exponential projections. Anyway, there’s a million different approaches one could take. The approach we took in this paper was essentially say, okay, which of these methods got previous periods right? Like when we passed one degree or when we passed 0.5 degrees, how resilient are they to like volcanic eruptions or weird El Niños or these other sort of things. But I do think the world is probably going to firmly pass 1.5 degrees by about 2028 or so, you know, it’s coming up pretty darn quickly.
Robinson Meyer:
I’ve always felt like we needed a number that was not just how much warmer is it than average. We need a kind of global warming index number, like a climate changey index that can spit out one number that says how much worse are things right now. The issue is that once you start thinking about what such an index would look like, you realize that you basically just want the global temperature average and also that it’s basically going to go up all the time. And so it doesn’t really have a useful function, except You know, when Europe is having a giant heat wave, you could be like, oh, it’s especially climate changey right now.
Zeke Hausfather:
We do have this human-induced warming estimate that we publish every year in the sort of climate change indicators report that Pierce Foster leads. And I think this year is about 1.4 degrees of pre-industrial levels was our
Zeke Hausfather:
best estimate for 2025, which is, you know, pretty darn close to 1.5.
Robinson Meyer:
We’re talking about this question of climate sensitivity, which is how responsive is the climate system when one doubles atmospheric CO2? CO2. And in many ways, it’s one of the core questions in climate science. And for a long time, we kind of had a distribution for it. We knew what the range of climate sensitivity might be, but we hadn’t made a lot of progress in cutting off the tails. You were a co-author on a 2020 paper that cut off the extreme low end and extreme high end estimates using a number of different lines of evidence. Given what we’ve seen since 2020, where there’s been this seeming acceleration in global warming, does that affect the conclusions of that work at all? Are you more worried that we’re on the high end or that there are more extreme high end possibilities within the climate system that maybe weren’t countenanced by how that paper was run? Or are we just landing, I believe that paper was found that climate sensitivity was somewhere between 2.6 and 3.9 Celsius, are we like pointing more toward the 3.9 side than the 2.6 side, given what we’ve seen over the past few years?
Zeke Hausfather:
So we rounded those numbers a bit in terms of what ended up in the IPCC sixth assessment report. But the IPCC report said that the likely range of climate sensitivity and likely in the IPCC’s parlance means there’s a roughly two-thirds chance it’s in that range was between 2.5 and 4C per doubling CO2. And the very likely range, the 90th percentile range, which I find more useful, to be honest, because a lot of things happen outside of a two thirds chance is somewhere between 2C and 5C if we double CO2. And that’s a pretty big range, right? A lot of stuff can happen between 2C and 5C, but...
Zeke Hausfather:
You know, we are doing an updated report, hopefully in time for the IPCC 7th assessment report that’s going to incorporate all of the evidence that’s come out since 2020, because, you know, it is a big question in climate science. And there’s been a lot of work that has come out in the last six years on this topic. And, you know, I don’t want to spill the beans early, so to speak, in terms of what we’re going to find. But I will say that there’s sort of two countervailing factors, one supporting higher sensitivity and one constraining it a bit. So the thing supporting higher climate sensitivity is what we’re seeing with earth energy imbalance. So this measurement we get from satellites of how much heat is being trapped in the climate system, which is something that’s a fairly new instrument. You know, we don’t have a super long record of it, but it is in some ways the most important measure because it is capturing the sum of the whole climate system. Now, it has shown values that are a bit on the high side of what most climate models expect. And so is an indication that climate sensitivity might be on the higher end, but it is also one satellite and a relatively short record. And so there’s reasons not to just use that as the only bit of information we have. The other thing that we have is the paleoclimate records. So the Earth’s more distant past, particularly the last ice age,
Zeke Hausfather:
The Pliocene, the Eocene, these sort of periods in the Earth’s more distant past that we have measurements of both carbon dioxide and greenhouse gas concentrations, but also of temperatures from proxy records. And those tend to suggest that climate sensitivity is not much above 5 degrees C. You know, if you have a really sensitive model, for example, it’s going to run away to snowball earth if it tries to simulate the last ice age. And there’s been a lot of work by that community to use things like pattern effects and sort of how the continents and ice sheets and everything were different in that period than they are today to try to infer what the relationship in that period means for climate sensitivity today. And I think that has not necessarily been pointing toward very high climate sensitivity. But that said, 5C warming for doubling CO2 is still very much in the range of possibilities. And so there’s been a bit of a heated debate between myself and Jim Hansen and a number of other folks in the community about this topic. And Hansen’s been arguing that climate sensitivity is probably close to 5C. And the rest of us have been saying that it could be. But across all the lines of evidence we have, we don’t necessarily think that it’s more likely to be 5C than 3C, right? I personally wouldn’t be surprised if at the end of the day, in the next IPCC report, we move the best estimate up to closer to 3.5 degrees C for doubling of CO2 from three. But it’s early days, and that’s not my chapter, so I don’t get to decide that.
Robinson Meyer:
Well, speaking of emissions, you recently published a blog post on the emissions intensity of using AI. And I appreciated it for a number of reasons, including the fact that you drew on this John Bistline paper, who’s a researcher at Watershed, trying to estimate the emissions intensity of AI, which was in turn covered by my colleague, Emily Panacorvo. So always great to see heat map in the mix. But your general takeaway from this paper and also from your own estimates was that AI, probably at this point, given how we use it, is much more emissions intensive than maybe early estimates or is somewhat more emissions intensive than early estimates and you were able to put some error bars around how we should think about electricity use associated with both chatbot ai and then also agentic and cloud code style ai and describe a little bit what you think the discourse is missing right now around those topics and why you think speaking of estimates coming in on the high end why some of the more popular estimates around the emissions intensity of AI may underestimate its emissions.
Zeke Hausfather:
So when you’re looking at AI energy use, there’s sort of top-down and bottom-up approaches you can take. I think the top-down numbers are broadly right, and those are the ones that give like, I don’t know, 15% of U.S. electricity use by 2030 going to AI data centers on the high end. I’m not arguing that estimates like those are too low. What this piece was more about is, what is the impact of me as an individual using AI tools? And there, the numbers that were published last year in 2025 by folks like Google or by OpenAI are not very realistic to the way people are actually using AI today. So these numbers that were published in 2025 were that AI per prompt, and by prompt, they mean typing something in a chat GPT text box and hitting enter and getting a response without a reasoning model, important distinction. So just one shot. But those take about 0.3 watts of energy, which really isn’t much, right? At 0.3 watts, you could do many, many, many thousands or tens of thousands of AI prompts and still have much lower impact than, you know. Running your air conditioner in the afternoon or, you know, driving to work.
Robinson Meyer:
That’s less than how a light bulb used to be. So if you didn’t feel bad about adding a single new lamp to your home, then you shouldn’t feel bad, so to speak, about using AI under that estimate. Yeah.
Zeke Hausfather:
But the problem, of course, is that some people are still using AI that way, but increasingly AI is being used in an agentic form. And that more means that you give AI a set of instructions or a goal to achieve. And then AI goes off and does many, many, many, things to try to achieve that goal. AI agents are, at least in the corporate world and the software engineering and scientific world, the vast majority of AI use today. And those agents make both much more complicated calls than the prompts would suggest and many, many more calls. And so when you look at the actual energy use of these AI agents, it’s something on the order of 600 times larger per prompt than the traditional, like, type something in a chat box and got to get an immediate response. And so that does end up adding up. I actually looked at two months of my own AI use because I had local logs of all of the numbers there.
Robinson Meyer:
When you say local AI use, these are calls you’re making locally to ChatGPT or Claude that you’ve retained a record for but the ai is still being run on an external device you don’t have a power meter hooked up to your desktop
Zeke Hausfather:
Yeah my desktop is using next to nothing this is some data center spinning up to process the call i made on my local cloud code but i found that on average i was using about three kilowatt hours a day for my agentic energy use which is the equivalent of running two refrigerators so that’s not nothing in big days when i was really doing some complicated like geospatial analysis or big data crunching exercise, I was using upwards of 10 kilowatt-hours per day. So maybe a third of the typical US household energy is just going to AI agents. And if you annualize that over the entire year, you end up with numbers that they’re not crazy. So for an entire year, my estimate is that my agentic AI energy use is about 1.1 megawatt-hours. If you convert that to CO2, again, using sort of a roughly average grid intensity, It’s about 370 kilograms of CO2. So that’s roughly half of a transcontinental flight. So again, it’s not enormous in terms of my overall emissions, but it’s also not trivial, like some of these initial estimates that came out last year would suggest.
Robinson Meyer:
Carbon emissions with average U.S. grid intensity or with the likely kind of it’s all coming from gas that...
Zeke Hausfather:
All coming from gas and average U.S. grid intensity are not that far apart at the moment.
Robinson Meyer:
Yes.
Zeke Hausfather:
Yeah. So this is using a bit of location-based analysis, but it’s pretty close to the all-gas assumption now. Where I’ve gotten some criticism there is people who said, well, if you account for the fact that these AI companies are buying RECs to cover their data center energy use by building clean energy elsewhere, even if it’s not directly powering the data center, then the number is probably lower. Which, you know, might be fair if they actually disclosed what those numbers would be, I would be happy to use them. But unfortunately, at the moment, AI companies are really not telling us much about the actual energy use of their products. And so we’re having to infer all this with very indirect methods. One of the main takeaways from this piece should be a plea for AI companies to be more transparent and actually tell us how much energy their systems are using.
Robinson Meyer:
I think this is very striking, particularly by Anthropic, which I think has published absolutely no estimates per token of its emissions intensity or energy use, even though it’s the quote unquote kind of good AI company. We just are kind of completely in the dark about what Claude uses. And in fact, we know that Anthropic is contracted with one of the Colossus data centers built by XAI, which is one of the worst offenders in terms of particularly emissions-intensive generation.
Robinson Meyer:
We’re going to have to leave it there. As El Niño continues to develop, maybe we’ll have you back to talk about just how bad it is. Zeke Hausfather, thank you so much for joining us on Shift Key.
Zeke Hausfather:
Thanks, Rob. It was a great conversation.
Robinson Meyer:
And that will do it for us this week, but we’ll be back next week with a new episode of ShiftKey. Until then, Shift Key is a production of Heatmap News. Our editors are Jillian Goodman and Nico Lauricella. Multimedia editing and audio engineering is by Jacob Lambert and by Nick Woodbury. Our music’s by Adam Kromelow. Thanks so much for listening. We’ll see you next week.