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In this special edition of Shift Key, Rob talks to Eurasia Group’s Gregory Brew about how the U.S.-Israeli-led conflict will reshape global energy markets.

The United States and Israel have launched a devastating new war on Iran. What has happened so far, when could it end, and what could it mean for oil, gas, and the global energy shift?
Rob is joined by Gregory Brew, an analyst with the Eurasia Group’s energy, climate, and resources team focused on the geopolitics of oil and gas. He serves as the group’s country analyst for Iran. He’s also an historian of modern Iran, oil, and U.S. foreign policy, and the author of two books about the subject.
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: I think the first place that people’s minds go when you’re talking about Iran, when you’re talking about the Strait of Hormuz, is oil. Why is the Strait of Hormuz particularly important to the global oil market? And then second of all, what have we seen as the initial effects here?
Gregory Brew: So the Strait of Hormuz matters for three reasons. One, it is a very narrow waterway. So it is quite easy, theoretically, to block it. Other waterways — even the Bab el-Mandab and the Red Sea, the Strait of Malacca, other strategic pathways through which large quantities of energy move — are not so easily disrupted as the Strait of Hormuz. That’s reason number one.
Reason number two, Iran. Iran is there. Iran frequently threatens to block the Strait of Hormuz, frequently threatens to close the Strait of Hormuz. It is a hostile actor vis-à-vis the other states in the region. We are now seeing proof of that, given that it is open fire on the GCC in a concerted way. That’s another reason why the Strait of Hormuz gets so much attention as far as the connection between the strait, the strait security and the situation in the global oil market.
The third reason — I guess there are four reasons. The third reason is the volume of energy moving through the strait. It’s close to a fifth of global oil supply. It’s 20 million barrels a day, sometimes a little more. It’s a significant portion of the global LNG supply coming from Qatar has to pass through the Strait of Hormuz. A large quantity of refined products, metal distillates, condensates, fuel oil moves through the strait. So the volume affected by the strait being closed or disrupted or affected in some way is very, very large.
Finally, fourth point, there’s nowhere else to go. You can’t go around the Strait of Hormuz. You have to go through it. Tankers that can’t transit the strait or are blocked from doing so have no other options. There’s no Africa route, as there was with the Red Sea disruption. So for those four reasons, the Strait of Hormuz gets a lot of attention. And it’s why it’s getting attention now. Although, interestingly enough, price of oil has responded, but has not moved so in a significant way, at least per some people’s expectations.
Meyer: Well, the theme of the year in oil so far has been that there’s a glut of oil. Or there’s at least a small glut of oil. We’ve kind of been dealing with that for a long time. And so I wonder if that is in some way — one hesitates to call this good for oil markets, but it is kind of solving an issue for the market. Do you think oil is the most important energy product affected by this war?
Brew: Well, it’s certainly the largest in terms of volume, given how much oil moves through the strait. However, I think this could end up being a gas story as much as an oil story.
You can find a full transcript of the episode here.
Mentioned:
From Heatmap: War With Iran Isn’t Just an Oil Story
From Heatmap: How Trump’s War Could Destabilize the Global Energy Market
This episode of Shift Key is sponsored by …
Accelerate your clean energy career with Yale’s online certificate programs. Explore the 10-month Financing and Deploying Clean Energy program or the 5-month Clean and Equitable Energy Development program. Use referral code HeatMap26 and get your application in by the priority deadline for $500 off tuition to one of Yale’s online certificate programs in clean energy. Learn more at cbey.yale.edu/online-learning-opportunities.
Music for Shift Key is by Adam Kromelow.
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France’s deadliest heat wave since 2003 killed more than 2,700 people — and possibly as many as 5,700.
More than 5,700 excess deaths were recorded in France during this summer’s record-breaking heat wave, the country’s health agency announced today. That makes the event — which ran, by the official reckoning, from June 17 to July 2 — the country’s deadliest heat wave in more than 20 years.
That’s in line with other estimates we’ve heard. EuroMOMO, a network of European public health agencies that track excess mortality, found that the continent saw more than 10,000 excess deaths during the same period. Roughly 90% of those victims were older than 65, it said. (France’s cohort seems similar: Adults older than 75 made up about two-thirds of the victims, the government said.)
These numbers are staggering — and much larger than some astute Heatmap readers might anticipate. If you read my colleague Jeva Lange’s piece on why it’s so hard to estimate heat deaths last week, she cited a much smaller estimate: Roughly 2,700 died in France during the most recent heat wave. That tally came from Christopher Callahan, an Indiana University scientist who studies climate change’s economic and social costs.
Why is there such a gap between the figures? I emailed Callahan to find out. He shared a few thoughts. First, he uses a different (and theoretically more rigorous) method than the French government: “Our approach uses a statistical relationship between temperature and mortality to explicitly quantify how many additional deaths are associated with a given day’s temperature,” he wrote. “France’s report of excess deaths is just based on how many more people died in late June compared to previous Junes - but we don’t know if those people died because of the heat or some other factor.” (Carbon Brief recently published a Q&A on these varying approaches.)
That might mean his estimate is right, in which case France has misidentified roughly nearly 3,000 deaths. But it could also mean his model, which is trained on data from 2004 to 2019, is “missing something,” he said, like a post-Covid change to public health risk. Last year, Callahan and his colleagues used a similar model to estimate deaths from France’s worst-ever heatwave, a 2003 episode that overwhelmed morgues and killed about 16,000 people. Even 23 years ago, global warming helped make that disaster larger than it needed to be: Some 6,000 of those deaths were due to climate change, their paper found.
Either estimate of the 2026 heat wave, of course, is shattering. As Jeva wrote, even the lower figure would mean the 2026 heat wave killed as many people as died in three years of French homicides. But the divergence in estimates tells us something else too: Even as climate change breaks records and alters our world, we’re never going to quite agree on where it ends and normal randomness begins.
The AI data center boom does not seem close to ending. Google’s parent company, Alphabet, announced its second quarter results this evening, and it beat Wall Street’s expectations, nearly quadrupling its profit on a year-over-year basis. Among the drivers: Its cloud business grew 82% compared to the same quarter last year. (As I’ve written, that rapid growth is helping to turn Alphabet and other hyperscalers into light industrial firms.)
The company’s AI bets seem to be paying off so far — so Google is now planning on spending even more on data centers, energy infrastructure and AI development this year than it once anticipated. It raised its estimates of 2026 capital expenditure to $195 billion to $205 billion, which is above earlier projections and twice as much as it spent in the same category last year. 2027 could be even bigger, it signaled. The company’s shares fell slightly on the news in after-hours trading, but from an energy and climate wonk perspective, the message is clear: For now, the AI demand surge transforming the power sector — and the real economy — continues to chug along.