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We didn’t know it was coming. We didn’t know where it came from. We still can’t nail its climate change connection.

What happened?
No, seriously — what happened?
Last week, the American megalopolis, that string of jewels on the old Atlantic coast, found itself shrouded by wildfire smoke. New York City’s air turned ashen and dun, then glowed a supernatural amber. For the first time in who-knows, sightseers standing at the U.S. Capitol Building could not see the Washington Monument, a mile and change down the Mall.
You could list the sports games canceled or flights delayed, but what was oddest about the event was the sheer ubiquity of it. This was one of the few news stories I can remember where you could look up from whatever article you were reading and see the story itself, softly lapping at your window.
And then it was gone. By Friday, the haze had blown out to sea.
It was, in retrospect, a strange time — deeply strange, humblingly strange, strange before almost any other quality. More than 128 million Americans were under an air-quality alert on Wednesday night — roughly the population of Germany and Spain combined — but scarcely 36 hours earlier, nobody had known to prepare for anything worse than a moderate haze. The country’s biggest wildfire-pollution event on record arrived essentially out of nowhere.
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One of the main modes of journalism today — but also, frankly, one of the main frames of our whole cultural apparatus, from TikToks that lightly gloss Wikipedia articles to rampant right-wing conspiracism — is that of the explanation. Everyone explains what’s happening to each other, as it happens, at all times, and therefore makes the world seem rational, empirical, and less frightening. Yet with the wildfire smoke, what is so striking is how little we understood. Nearly every important step in the story was misapprehended as it happened.
We didn’t know that the smoke was coming, for instance. On Tuesday morning, meteorologists predicted that the same moderate haze that has hung around all season would again hit the East Coast. The New York Department of Environmental Conservation put out an alert saying that the air quality index, or AQI, might rise to 150 across the state.
They did not forecast — nobody, as far as I can tell, did — that the worst air pollution in decades would soon wallop the state. By Tuesday night, New York City’s AQI had already reached 174, according to Environmental Protection Agency data. As I walked home in D.C., I could see tendrils of visible smoke hugging the upper stories of apartment buildings.
This prediction failure gave the ensuing response a halting, confused quality. How could such a massive event come out of nowhere? Not until Thursday afternoon — when the smoke had nearly passed — did the federal government advise its workers that they could telework or take vacation time to avoid the bad air. On Friday, New York closed in-person schools, just in time for blue sky to return.
I find it hard to blame them. This was an unprecedented event in part because the fires were so far from where they affected. Everyone had seen the videos of smoke besieging Portland and San Francisco in 2020, but back then, the fires had been near those cities — a couple hundred miles away at most. Where was the smoke coming from now? The Adirondacks were fine. Vermont was’t burning.
Here, we misunderstood again. Many outlets — including this one, at first — initially reported that the smoke came from Nova Scotia, where large and destructive fires had raged the week before. But those fires had been doused over the weekend by some of the same weather pattern that was now ferrying smoke to us. In fact, the smoke had come from the boreal forests of northern Quebec, more than 500 miles from New York City.
Why were these fires raging? Not even Canadians could give a good answer. With fires in Alberta and Nova Scotia gobbling attention and resources, the Quebec fires had seemingly been an afterthought until their smoke blew into Toronto and Ottawa, which happened only a few hours before it arrived in New York. Suddenly, a secondary event had become the main event.
On Wednesday, I talked to a Canadian climatologist who seemed hazy about why Quebec was burning in the first place. “I think this situation is kind of similar to Nova Scotia,” he told me, blaming that province’s warm, dry spring for the blazes. But this explanation — which appeared in many outlets — was only somewhat true: While Quebec had suffered a warm May, it was not in drought.
We did not understand why these fires are burning — and honestly, we still don’t. President Joe Biden said that the smoke provided “another stark reminder of the impacts of climate change.” I am not so sure. There’s no doubt, to be clear, that climate change will make wildfires worse across North America: The Intergovernmental Panel on Climate Change says that hot, dry “fire weather” will increase throughout the 21st century. But, again, Quebec is not in drought. As for today, no climate-change signal has appeared in eastern Canadian wildfire data. Their connection to climate change is far less clear cut than it is in, say, California’s blazes.
Yet neither would I condescend to someone who does blame climate change here. When something like this happens, how can you not cite the planet’s biggest ongoing physical transformation? If climate change makes flukey weather more likely, shouldn’t we at least consider it being responsible for some of the flukiest weather in decades? The thing about unprecedented events is that you lack precedent for them.
Not that we completely lack an example for this. In 1780, the sun was blotted out across New England. Nocturnal animals came out; people fretted in the streets and abandoned their work; the Connecticut state legislature considered adjourning for doomsday. Not until a decade ago did we finally learn that the “dark day” was caused by Canadian wildfire smoke drifting south.
Which suggests that this might be a once-in-250-year event. But maybe it’s not any more. Maybe with climate change, it’s a once-a-century event. Or a once-in-a-decade event. For now, the sample size is two.
So I wonder: If it wasn’t climate change, would it matter? The pandemic has already taught us that indoor air quality matters, that unseen particles floating in the air can do serious harm. No matter what happens with the climate, Canada is too large and unpopulated to fight every wildfire; neither can it manage the same kind of labor-intensive forest management that California might attempt. East Coasters should come away from our own dark days with new compassion for people out West — and those across the world — who must deal with wildfire smoke on a seasonal basis, not to mention the fires themselves. Regardless of climate change’s role in this fire, it makes wildfires more likely: We should continue to try to decarbonize as fast as we can.
But as for local policy, perhaps our aims should be humbler. We now know (again) that a great cloud of wildfire smoke can blow up on the East Coast at any moment and poison our air. We don’t need to know everything to protect ourselves and our neighbors from that. Air filters cost hundreds of dollars, but not thousands; in new multi-family buildings, they are built into the ventilation system itself. Perhaps the right lesson from this outbreak should be to change our expectations, and think of indoor air filtering like brushing your teeth — a habit essential to our hygiene, to be used by all, and to be provisioned for those who cannot afford one at the public expense.
Maybe that’s prudent climate adaptation. Or maybe — in the wake of COVID, Canadian smoke, and who-knows-what-comes-next — it’s just new common sense.
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The Trump administration’s rollback of coal plant emissions standards means that mercury is on the menu again.
It started with the cats. In the seaside town of Minamata, on the west coast of the most southerly of Japan’s main islands, Kyushu, the cats seemed to have gone mad — convulsing, twirling, drooling, and even jumping into the ocean in what looked like suicides. Locals started referring to “dancing cat fever.” Then the symptoms began to appear in their newborns and children.
Now, nearly 70 years later, Minimata is a cautionary tale of industrial greed and its consequences. Dancing cat fever and “Minamata disease” were both the outward effects of severe mercury poisoning, caused by a local chemical company dumping methylmercury waste into the local bay. Between the first recognized case in 1956 and 2001, more than 2,200 people were recognized as victims of the pollution, which entered the population through their seafood-heavy diets. Mercury is a bioaccumulator, meaning it builds up in the tissues of organisms as it moves up the food chain from contaminated water to shellfish to small fish to apex predators: Tuna. Cats. People.
In 2013, 140 countries, including the U.S., joined the Minamata Convention, pledging to learn from the mistakes of the past and to control the release of mercury into the environment. That included, explicitly, mercury in emissions from “coal-fired power plants.” Last month, however, the U.S. Environmental Protection Agency retreated from the convention by abandoning the 2024 Mercury and Air Toxics Standards, which had reduced allowable mercury pollution from coal-fired plants by as much as 90%. Nearly all of the 219 operating coal-fired plants in the U.S. already meet the previous, looser standard, set in 2012; Trump’s EPA has argued that returning to the older rules will save Americans $670 million in regulatory compliance costs by 2037.
The rollback — while not a surprise from an administration that has long fetishized coal — came as a source of immense frustration to scientists, biologists, and activists who’ve dedicated their careers to highlighting the dangers of environmental contaminants. Nearly all human exposure to methylmercury in the United States comes from eating seafood, according to the EPA, and it’s well-documented that adding more mercury to the atmosphere will increase levels in fish, even those caught far from fenceline communities.
“Mercury is an extremely toxic metal,” Nicholas Fisher, an expert in marine pollution at Stony Brook University, told me. “It’s probably among the most toxic of all the metals, and it’s been known for centuries.” In his opinion, it’s unthinkable that there is still any question of mercury regulations making Americans safer.
Gabriel Filippelli, the executive director of the Indiana University Environmental Resilience Institute, concurred. “Mercury is not a trivial pollutant,” he told me. “Elevated mercury levels cost millions of IQ points across the country.” The EPA rollback “actually costs people brain power.”
When coal burns in a power plant, it releases mercury into the air, where it can travel great distances and eventually end up in the water. “There is no such thing as a local mercury problem,” Filippelli said. He recalled a 2011 study that looked at Indianapolis Power & Light, a former coal plant that has since transitioned to natural gas, in which his team found “a huge plume of mercury in solids downwind” of the plant, as well as in nearby rivers that were “transporting it tens of kilometers away into places where people fish and eat what they catch.”
Earthworms and small aquatic organisms convert mercury in soils and runoff into methylmercury, a highly toxic form that presents the most danger to people, children, and the fetuses of pregnant women as it moves up the food chain. Though about 70% of mercury deposited in the United States comes from outside the country — China, for example, is the second-greatest source of mercury in the Great Lakes Basin after the U.S., per the National Oceanic and Atmospheric Administration — that still leaves a significant chunk of pollution under the EPA’s control.
There is, in theory, another line of defense beyond the EPA. For recreational fishers, of whom there are nearly 60 million in the country each year, state-level advisories on which waterways are safe to fish in based on tests of methylmercury concentrations in the fish help guide decisions about what is safe to eat. Oregon, for example, advises that people not eat more than one “resident fish,” such as bass, walleye, and carp, caught from the Columbia River per week — and not eat any other seafood during that time, either. Forty-nine states have some such advisories in place; the only state that doesn’t, coal-friendly Wyoming, has refused to test its fish. One also imagines that safe waterways will start to become more limited if the coal-powered plants the Trump administration is propping up forgo the expensive equipment necessary to scrub their emissions of heavy metals.
“It’s not something where you’re going to see a dramatic change overnight,” Tasha Stoiber, a senior scientist with the Environmental Working Group, a research and advocacy nonprofit that focuses on toxic chemicals, told me. “But depending on the water body that you’re fishing in, you want to seek out state advisories.”
For people who prefer to buy their fish at the store, the Food and Drug Administration sets limits on the amount of mercury allowed in commercial seafood. But Kevin McCay, the chief operations officer at the seafood company Safe Catch, told me the FDA’s limit of 1 part per million for methylmercury is outrageously high compared with limits in the European Union and Japan. “It has to be glowing red before the FDA is actually going to do anything,” he said. (Watchdog groups have likewise warned that the hemorrhaging of civil servants from the FDA will have downstream consequences for food safety.)
McCay also told me that he “certainly” expects mercury levels in the fish to rise due to the EPA’s decision. Unlike other canned tuna companies that test batches of fish, Safe Catch drills a small test hole in every fish it buys to ensure the mercury content is well below the FDA’s limits. (Fish that are lower on the food chain, like salmon, are the safest choices, while fish at the top of the food chain, like tuna, sharks, and swordfish, are the worst.)
The obsessive oversight gives the company a front-seat view of where and how methylmercury is working its way up the food chain, and McCay worries his company could face more limited sourcing options in the coming years if policies remain friendly to coal. (An independent investigation by Consumer Reports in 2023 found that even fish sourced by an ultra-cautious company like Safe Catch contain some level of mercury. “There’s probably no actual safe amount,” McCay told me, recommending that customers should eat a diverse range of seafood to limit exposure.)
Even people who don’t eat fish should be concerned, though. That’s because, as Filippelli told me, “a lot of [contaminated] fish meal is being incorporated into pet food.”
There are no regulatory standards for mercury in pet foods. But avoiding mercury is not as simple as bypassing the tuna-flavored kibble, Sarrah M. Dunham-Cheatham, who authored a 2019 study on mercury in pet food, told me. Even many brands that don’t list fish among their ingredients contain fish meal that is high in mercury, she said.
Different species also have different sensitivities to mercury, with chimpanzees and cats being among the most sensitive. “I don’t want to be alarmist or scare people,” Dunham-Cheatham said. But because of the issues with labeling pet food, there isn’t much to be done to limit mercury intake in your pets — that is, short of dealing with the emissions on local and planetary scales. “We’re expecting there to be more emissions to the atmosphere, more deposition to aquatic environments, and therefore more mercury accumulated into proteins that will go into making the pet foods,” she said.
To Fisher, the Stony Brook professor, the Trump administration’s decision to walk back mercury restrictions makes no sense at all. The Ancient Romans understood the dangers of mercury; the dancing cats of Minamata are now seven decades behind us. “Why should we make the underlying assumption that the mercury is innocent until proven guilty?” he said.
On Qatari aluminum, floating offshore wind, and Taiwanese nuclear
Current conditions: Upstate New York and New England are facing another 2 inches of snow • A heat wave in India is sending temperatures in Gujarat beyond 100 degrees Fahrenheit • Record-breaking rain is causing flash flooding in South Australia, New South Wales, and Victoria.
The war with Iran is shocking oil and natural gas prices as the Strait of Hormuz effectively closes and Americans start paying more at the pump. “So despite the stock market overall being down, clean energy companies’ shares are soaring, right?” Heatmap’s Matthew Zeitlin wrote yesterday. “Wrong. First Solar: down over 1% on the day. Enphase: down over 3%. Sunrun: down almost 8%; Tesla: down around 2.5%.” What’s behind the slump? Matthew identified three reasons. First, there was a general selloff in the market. Second, supply chain disruptions could lead to inflation, which might lead to higher interest rates, or at the very least slow the planned cycle of cuts. Third, governments may end up trying “to mitigate spiking fuel prices by subsidizing fossil fuels and locking in supply contracts to reinforce their countries’ energy supplies,” meaning renewables “may thereby lose out on investment that might more logically flow their way.”
The U.S. liquified natural gas industry is certainly looking at boom times. U.S. developers signed sale and purchase agreements for 40 million tons per year in 2025 from planned export facilities, according to new Department of Energy data the Energy Information Administration posted. That’s the highest volume since 2022, when Russia’s invasion of Ukraine sent demand for American LNG soaring. That conflict, too, is still having its effects on global fossil fuel supplies. A Russian-flagged LNG tanker is on fire in the Mediterranean Sea as the result of a drone strike by Ukraine, The Independent reported Wednesday.
It’s not just fossil fuels. Qatari smelter Qatalum started shutting down on Tuesday as 50% shareholder Norsk Hydro issued a force majeure notice to customers. “The decision to shut down was made after the company’s gas supplier informed it of a forthcoming suspension of its gas supply,” the company said in a statement to Mining.com. QatarEnergy — which owns 51% of Qatalum’s other shareholder, Qatar Aluminum Manufacturing Co. — had previously suspended production after halting output of natural gas due to Iranian drone attacks.
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Panel manufacturer Silfab Solar paused production at its South Carolina factory in Fort Mill after a chemical spill triggered a regulatory investigation. The plant accidentally spilled approximately 300 gallons of a water solution containing less than 0.3% potassium hydroxide. Experts told WCNC, the Charlotte-area NBC News affiliate, that the volume of the caustic chemical that spilled will be harmless. But the state Department of Environmental Services “asked Silfab to cease receipt of additional chemicals at their facility until an investigation is complete.” Such accidents risk political backlash at a time of heightened public health anxiety over clean energy technologies. As Heatmap’s Jael Holzman wrote last summer, the Moss Landing battery factory fire sparked a nationwide backlash.
Two-thirds of offshore wind potential is located at sites where the water is too deep for traditional turbine platforms. But the first wind farm with floating platforms only came into operation nine years ago. The largest so far, located in Norway’s stretch of the North Sea, is just under 100 megawatts. So, if completed, Spanish developer Ocean Winds’ in the United Kingdom would be by far the largest plant. The company took a step forward on the 1.5-gigawatt project when the company signed the lease agreement this week, according to OffshoreWIND.biz.
In Denmark, meanwhile, right-wing politicians are campaigning against the country’s offshore wind giant, Orsted. The country’s conservative Liberal party campaigned on divesting from the company, which claims the Danish government as its largest shareholder, back in 2022. Now, Bloomberg reported, the party is once against renewing its calls to exit Orsted after this year’s election.

Facing surging electricity demand and mounting threats of blackouts from Chinese attacks on energy imports, Taiwan is taking yet another step toward reversing its nuclear phaseout. Nearly a year after the island nation’s last reactor shut down, Taiwanese Premier Cho Jung-tai, a member of the ruling Democratic Progressive Party that has long opposed atomic energy, announced new proposals to allow the state-owned Taiwan Power Company to submit plans to restart at least two of the country’s three shuttered nuclear stations. (A fourth plant, called Lungmen, was nearly completed in the late 2010s before the DPP government canceled its construction.) The government report also said Taiwan may consider building new nuclear technologies, such as small modular reactors or fusion plants.
In June 2023, thousands of lightning strikes in heat wave-baked Quebec sparked more than 120 wildfires that ultimately scorched nearly 7,000 acres of parched forests. Lightning, in fact, starts almost 60% of wildfires. Now a Vancouver-based weather modification startup called Skyward Wildfire says it can prevent catastrophic blazes by stopping lightning strikes through cloud seeding. MIT Technology Review found some good reasons to doubt the company’s claims. But experts said preventing wildfires is cheaper than putting them out, so it may have some merit.
The attacks on Iran have not redounded to renewables’ benefit. Here are three reasons why.
The fragility of the global fossil fuel complex has been put on full display. The Strait of Hormuz has been effectively closed, causing a shock to oil and natural gas prices, putting fuel supplies from Incheon to Karachi at risk. American drivers are already paying more at the pump, despite the United States’s much-vaunted energy independence. Never has the case for a transition to renewable energy been more urgent, clear, and necessary.
So despite the stock market overall being down, clean energy companies’ shares are soaring, right?
Wrong.
First Solar: down over 1% on the day. Enphase: down over 3%. Sunrun: down almost 8%; Tesla: down around 2.5%.
Why the slump? There are a few big reasons:
Several analysts described the market action today as “risk-off,” where traders sell almost anything to raise cash. Even safe haven assets like U.S. Treasuries sold off earlier today while the U.S. dollar strengthened.
“A lot of things that worked well recently, they’re taking a big beating,” Gautam Jain, a senior research scholar at the Columbia University Center on Global Energy Policy, told me. “It’s mostly risk aversion.”
Several trackers of clean energy stocks, including the S&P Global Clean Energy Transition Index (down 3% today) or the iShares Global Clean Energy ETF (down over 3%) have actually outperformed the broader market so far this year, making them potentially attractive to sell off for cash.
And some clean energy stocks are just volatile and tend to magnify broader market movements. The iShares Global Clean Energy ETF has a beta — a measure of how a stock’s movements compare with the overall market — higher than 1, which means it has tended to move more than the market up or down.
Then there’s the actual news. After President Trump announced Tuesday afternoon that the United States Development Finance Corporation would be insuring maritime trade “for a very reasonable price,” and that “if necessary” the U.S. would escort ships through the Strait of Hormuz, the overall market picked up slightly and oil prices dropped.
It’s often said that what makes renewables so special is that they don’t rely on fuel. The sun or the wind can’t be trapped in a Middle Eastern strait because insurers refuse to cover the boats it arrives on.
But what renewables do need is cash. The overwhelming share of the lifetime expense of a renewable project is upfront capital expenditure, not ongoing operational expenditures like fuel. This makes renewables very sensitive to interest rates because they rely on borrowed money to get built. If snarled supply chains translate to higher inflation, that could send interest rates higher, or at the very least delay expected interest rate cuts from central banks.
Sustained inflation due to high energy prices “likely pushes interest rate cuts out,” Jain told me, which means higher costs for renewables projects.
While in the long run it may make sense to respond to an oil or natural gas supply shock by diversifying your energy supply into renewables, political leaders often opt to try to maintain stability, even if it’s very expensive.
“The moment you start thinking about energy security, renewables jump up as a priority,” Jain said. “Most countries realize how important it is to be independent of the global supply chain. In the long term it works in favor of renewables. The problem is the short term.”
In the short term, governments often try to mitigate spiking fuel prices by subsidizing fossil fuels and locking in supply contracts to reinforce their countries’ energy supplies. Renewables may thereby lose out on investment that might more logically flow their way.
The other issue is that the same fractured supply chain that drives up oil and gas prices also affects renewables, which are still often dependent on imports for components. “Freight costs go up,” Jain said. “That impacts clean energy industry more.”
As for the Strait of Hormuz, Trump said the Navy would start escorting ships “as soon as possible.”