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Vermont is on the verge of becoming the first state to try it.

Dozens of cities and states have tried to sue the oil industry for damages related to climate change over the past several years, and so far, none of these cases has been successful. In fact, not one has even made it to trial.
In the meantime, the price tag for climate-related impacts has climbed ever higher, and states are growing more desperate for help with the bill. Out of that desperation, a new legal strategy was born, one that may have a better chance of getting fossil fuel companies to pay up. And Vermonters may be the first to benefit.
It’s called a climate superfund bill, and versions of it are floating through legislative chambers in New York, Massachusetts, and Maryland, in addition to Vermont. Though each bill is slightly different, the general premise is the same: Similar to the way the federal Superfund law allows the Environmental Protection Agency to seek funds retroactively from polluters to clean up contaminated sites, states will seek to bill fossil fuel companies retroactively for the costs of addressing, avoiding, and adapting to the damages that the emissions from their products have caused.
Though New York was the first state to introduce a climate superfund bill two years ago, Vermont may be the first to get it through a legislature. On Friday, the Vermont Senate voted 21 to five to approve amendments to the bill, and will vote next week on whether to send it to the House. An equivalent bill in the House is cosponsored by nearly two-thirds of state representatives and the policy also won the support of Vermont’s Attorney General.
If it gets past the governor’s desk, the bill will kick off a multiyear process that, in the most optimistic case, could bring money into the state by 2028. The first step is for the state Treasurer to assess the cost to Vermont, specifically, of emissions from the extraction and combustion of fossil fuels from 1995 to 2024, globally. Regulators will then request compensation from responsible parties in proportion to the emissions each company contributed. The state will identify responsible parties by focusing only on the biggest emitters, companies whose products generated at least a billion tons of emissions during that time. The money will go toward implementing a state “resilience and implementation strategy” to be mapped out in the next two years.
The idea of states retroactively billing fossil fuel companies for damages outside the context of a lawsuit might sound a little far-fetched. Or, at least, I thought it was when I first heard about it. How can that be legal?
Anthony Iarrapino, the lead lobbyist supporting the bill for the Conservation Law Foundation, a New England-based environmental law nonprofit, explained it this way. There is established case law that deals with retroactive liability in the context of hazardous waste — again, the Superfund law. “Even if your activities were legal at the time you undertook them, if they result in making a mess, then you can be on the hook for cleaning that mess,” he told me. “The idea here is looking at climate disruption as a polluted site.”
How is that fair? Well, the legal precedents supporting the Superfund law and similar policies turn on a key question. Did the companies understand that their activities were potentially harmful at the time they engaged in them? “If, objectively, you knew or should have known that your conduct, whether it was legal or not, was likely to result in damages that would impose costs on society,” Iarrapino said, “then it's fair, from a lookback perspective, to hold you accountable when those damages begin to manifest in the environment or in impacts to human health.” That’s because, according to precedent, you essentially assumed the risk that at some point in the future, you might be on the hook.
By now there’s a mountain of evidence that fossil fuel companies like Exxon did, in fact, know how damaging their products would be several decades before the period covered by the Vermont bill, based on internal research not shared with the public at the time. But Ben Edgerly Walsh, an advocate at the Vermont Public Interest Research Group, told me that even absent that evidence, they should have recognized the risk based on the scientific consensus that emerged in the 1970s and 1980s. To wit: Vermont chose 1995 as the start year for its bill because that’s when the first United Nations climate change conference was held.
“We shouldn't have to bear the cost of this ourselves,” said Walsh. “These oil companies that are still making hundreds of billions of dollars in profit annually should have to pay their fair share for the cost of the climate crisis they caused.”
Underpinning the bill — as well as many of the related lawsuits — is the advancement of “attribution science,” or the ability to quantify the economic losses that a region has borne due to anthropogenic climate change, as well as future losses that are already baked in, and then attribute them back to particular emitters. In testimony for the Vermont superfund bill, Justin Mankin, an associate professor at Dartmouth, stressed that these are peer reviewed, consensus, scientific methods — and that in general, they are conservative. “It is my opinion that we are systematically underestimating the economic cost of climate change to date,” he told the Vermont Judiciary Committee in February. “And that is because all of these climate damage cost assessment methods are inherently conservative, or limited by data.”
The bill’s sponsors also looked to research from Richard Heede, creator of the famous “Carbon Majors” database, which calculated the emissions of major fossil fuel companies based on the amount of oil, gas, and coal they each extracted and found that some 70% of fossil fuel emissions since 1988 can be attributed to 100 companies. In testimony to the Vermont Senate, Heede estimated that about 68 companies would be captured by the bill’s billion-ton threshold.
Of course, the fossil fuel industry patently disputes the science that Heede and Mankin expounded. The American Petroleum Institute submitted testimony warning of the “difficulties of establishing a conclusive link between anthropogenic climate change and alleged injuries to Vermont” and arguing that the emissions from individual companies over the last several decades cannot “be determined with great accuracy.” The group also called it “unfair” to charge the companies that sold oil and gas, considering they “did not combust fossil fuels but simply extracted or refined them in order to meet the needs and demands of the people.”
That might be where the biggest weak spot in the climate superfund bills — as well as the climate damages lawsuits — lies. There’s an underlying philosophical question, Martin Lockman, a climate law fellow at Columbia University, told me. Who in the supply chain is responsible for the pollution from fossil fuels?
The answer turns on a moral argument that fossil fuel companies have made enormous profits from fossil fuels for decades, all while knowing what the harms would be. “From a moral perspective, I think that these are very justified,” said Lockman, “but that will certainly get opened in litigation.”
If any of the climate superfund bills pass, they will absolutely be challenged in court. One reason they may see more success than the more direct lawsuits, however, is that they flip the burden of proof. If Vermont sued oil companies for damages, the burden would be on Vermont to prove its case, and as the defendants, the oil companies would get a “bag of tricks” to use to stall the case and make it very expensive to pursue, said Iarrapino. For example, many of these lawsuits have been delayed by years-long arguments over whether they should be tried in state or federal court, or whether the oil companies have to release certain documents.
“Even though it’s the same harms and the same contexts,” Iarrapino told me, “you’ve got a balance of power where they can win the case by losing slowly.” But if oil companies sue Vermont, for example, by calling its law unconstitutional, the burden of proof will be on them, and the state will have no incentive to delay the case.
I should note here that the federal Superfund law is not exactly the ideal model for this policy. Much of the time, the EPA can’t track down a company to ascribe blame for the contamination, and taxpayers end up footing the bill of the cleanup. Even when it does find a responsible party, said party often ends up litigating the amount owed for years. The Passaic River in New Jersey was declared a Superfund site 40 years ago, and the EPA is still fighting with Occidental over how much it should pay for the cleanup.
Iarrapino thinks there’s one key difference in the proposed climate superfund program. At contaminated sites, there can be a lot of potential polluters and so it’s difficult to assign blame. The Vermont bill attaches liability directly to the act of extracting and refining fossil fuels for combustion. “You either did that or you didn't do that,” he said. When it comes to companies like Exxon and BP, “that is their whole reason for existing.” That doesn’t mean companies won’t use all the firepower they have to dispute the amount they owe, however.
It may seem unfair for a single state, especially one as small as Vermont, to win compensation first when the damages are global and unequally distributed. But Lockman of Columbia said if these bills are successful, fossil fuel companies may stop fighting liability entirely and instead push the federal government to take action so they can be held to a more consistent standard across the country.
When I first reached Iarrapino, he told me that just downstairs from his office, someone was sawing and hammering the walls because the first floor had been entirely underwater when Montpelier flooded last summer. Three businesses that were in the building are gone. A recent estimate puts the cost of state-wide damages from the storm at $600 million.
“At this point,” he said, “what else does a state like Vermont have to lose?”
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We didn’t know days like this could happen. Then we learned how bad they really are.
When I woke up this morning in Chicago, the Air Quality Index was in the 300s, and I could barely see the top of the skyscraper across the street. The weather app on my phone featured a little image of a man wearing a World War I-style full-face gas mask. That’s fun, I thought. I didn’t know it could do that.
I went downstairs. Old photographs of the city were hanging in the hotel lobby — girls playing in bathing suits next to the lake — and I realized that the haze shrouding the old Lakeshore Drive condos was in fact haze, smoke, particulate matter, and not a lens artifact. It really used to be that smoky all the time, back before the Clean Air Act. Then I glanced up and saw that the haze out the window was far worse than the century-old pollution in the picture.
It’s significant, I think, that a mass smoke-out like this has now happened to the eastern U.S. for a second time. Second times matter. When exhaust from Canadian wildfires blanketed the Northeast and parts of the Midwest in June 2023, exposing more Americans to wildfire smoke than on any previous day in history, one could almost write it off as a freak occurrence. It was upsetting, sure, and reminiscent of California’s climate-addled amber skies. But didn’t wildfire smoke also descend on New England once in the 1780s? Even on a warmer planet, couldn’t this remain a once-in-a-century blip?
Twice in just over three years, though — that‘s more than a hiccup. That’s almost a trend. To get smoked out once may be regarded as a misfortune; for it to recur again, without any plan to respond, starts to look like carelessness. The federal government is doing roughly diddly squat about adaptation — President Trump can build a fan on the border and make Canada pay for it — but state and local governments across the eastern U.S. will now need to reckon with a new form of extreme weather. You grew up with snow days, but now we’ll have smoke days — and schools and sports leagues and concert venues will need rules about how to deal with them. When should games be canceled, tickets refunded? Is smoke more like a heat wave or a hurricane? Hotels and office buildings will need to review their ventilation policies and possibly upgrade their equipment; municipal emergency response plans will be revised and printed in triplicate.
All this will happen because the smoke has invaded a second time — and arguably a third, if you count last year’s minor episode — and that means it could come back again. For that reason, this event strikes me as a much bigger deal than what happened in 2023. The smoke is now a fact of life; institutions will need a policy about it. The tortious creep of litigation risk will enforce that outcome, even if no federal official enforces it.
So it goes. But to be clear, this new inconvenience is not what worries me most about today’s events. No, what frightens me instead is that today’s airborne toxic event is not something that was supposed to happen. Until a few years ago, we had not thought too hard about whether a major smoke exposure event like this could happen on the East Coast at all. It had not seemed possible.
For years, economists and climate scientists have simulated how global warming might affect the U.S. and global economies. They poured years of careful work into this modeling, and they simulated — with ever-increasing levels of statistical persnicketiness — what extreme heat and sea-level rise might do to agricultural yield, labor productivity, energy demand, heat mortality, and real estate values, among other potential sources of damage. This work was useful; it improved our practical understanding of coastal flooding, to name one example. It also helped calibrate U.S. regulatory policy, even if it never achieved the crowning heights of helping to set a national carbon tax.
Yet these careful models almost never accounted for mass smoke exposure days. Indeed, the kind of thing that happened this week — when heavy haze blows down from Canada and exposes more than 100 million people to hazardous air — was not countenanced by the simulations at all. Only in recent years did economists begin to study events like these, and only because mass exposure events like 2023’s happened first.
We’ve long known that the tiny shreds of particulate matter in wildfire smoke dance across the body’s barriers and penetrate its deep places, etching their way into lung, heart, and brain tissue. Inflammation follows. What makes days like today unique is the scale: Tens of millions of Americans inhaling wildfire smoke at the same time. As we’ve started studying this phenomenon, it’s become clear that the mortality effects of days like today, the deaths elevated above what you’d otherwise expect, can persist for years. That becomes extraordinarily expensive for society.
How costly? “When monetized,” a group of Stanford and Princeton economists wrote in Nature last year, in the first major study on the topic, “the climate-driven smoke deaths result in economic damages that exceed existing estimates of climate-driven damages from all other causes combined in the U.S.A.”
You read that right: The cost of climate-worsened wildfire smoke alone is larger than what earlier studies said every other estimated cost of climate change would be, combined.
To summarize, wildfire smoke did not appear in our economic simulations of climate change. As recently as a few years ago, we did not really know that days like today — or June 7, 2023; or September 15, 2020; or September 9, 2020 — could occur. Then they happened. And happened again. And then we studied them and discovered that, in fact, they may be more expensive for the U.S. economy than we once thought climate change itself would be.
That worries me. Now we know these smoke-out days can happen; now they are fast becoming a rare but predictable feature of summer life. But until recently they were unimaginable. What other ignominies, what other tail risks and airborne surprises, are lurking in the uncontrolled experiment we’re running on the biosphere? What else — unforecast, unmodeled, unstudied, unthought of — lies ahead? After 10 years of covering the climate system, I am not someone who lies sleepless fretting about atmospheric CO2. But I do wonder what else we don’t know enough about to ask.
“Microsoft, you can’t hide, we can see your dirty side!”
Protestors interrupted one of the final sessions of PNW Climate Week — a conference that brings together climate leaders across Washington, Oregon, and British Columbia — objecting to Microsoft’s rising carbon emissions from data centers and partnerships with oil and gas companies. The company’s Chief Sustainability Officer Melanie Nakagawa was having a one on one conversation with GeekWire climate reporter Lisa Stiffler at Seattle’s City Hall when protestors carrying signs reading “Microsoft’s AI pollutes” and other slogans began shouting from the audience.
I was there, having just moderated the prior panel on how to finance Washington’s clean energy ambitions. Early on there were some rumblings in the crowd from up front. “Climate leaders don’t build gas pipelines in Moses Lake,” was the first objection I heard clearly. It came shortly after Nakagawa kicked off the conversation by highlighting Microsoft’s partnership with sustainable aviation fuel startup Twelve, which recently opened its first commercial-scale SAF plant in Moses Lake, Washington. The tech giant has supported the project through a strategic investment from its Climate Innovation Fund, as well as an offtake agreement for the fuel that will help offset its emissions from employee travel.
Whether Microsoft is building a gas pipeline in this particular community I haven’t been able to determine, though it seems irrelevant to Twelve’s SAF facility, which doesn’t rely on natural gas. But it is true that Microsoft is one of the largest power consumers in Grant County, Washington, home to Moses Lake, where a natural gas pipeline operator is looking to expand its network to accommodate data center load growth.
Another audience interruption was more pointed. “How does signing a 20-year deal with Chevron help you reach your clean energy goals?,” one protestor asked, referring to Microsoft's recently announced power purchase agreement with Chevron for nearly 2.7 gigawatts of natural gas-fired power to supply a West Texas data center. The project represents one of the largest gas-powered artificial intelligence developments in the U.S., and Stiffler acknowledged that she had been planning to ask about it, herself.
Nakagawa answered the question. at least in part, saying “that project with Chevron is initially using natural gas and it’s a natural gas contract,” before emphasizing that the company has built “over 4.5 gigawatts of clean energy already today,” and remains committed to balancing speed-to-power with its clean energy goals. She added that, “with this deal in particular, we’re looking at a range of tools in our toolbox to ensure that we can continue to grow our power, but also do so in a way that is responsible and sustainable.” She stopped short, however, of making any commitments to transitioning the project to renewable energy over time.
The session became more chaotic from there. Another protestor stood up, shouting that “Microsoft is enabling genocide in Palestine.” Other activists joined in, while still other audience members shouted back. As Nakagawa recovered and resumed answering a question from Stiffler about Microsoft’s recent decision to pause its carbon removal purchases after years of dominating the nascent industry, protestors throughout the crowd began a chant of “Microsoft, you can’t hide, we can see your dirty side.” Security eventually shepherded many of them out.
Stiffler continued speaking with Nakawaga about the company’s clean energy efforts, touching on many of the protestors’ concerns as she asked about community opposition to data centers, the role of large corporations in the clean energy transition, and whether Microsoft can realistically achieve its goal of becoming carbon negative by 2030.
Nakawaga emphasized that the company must, “first and foremost, listen to where the communities are and what they are calling for.” Regarding the concerns she hears most often, she explained that “first has been transparency. Second has been around resource uses and what are we doing about those resource uses. We’re hearing about jobs and employment and investments in education, investments in housing.”
If this session was any indication, those concerns won’t go away anytime soon.
Heat kills more Americans than any other extreme weather event in the United States. But wildfire smoke — while not strictly “weather” — appears to kill even more. Current excess death estimates put American heat mortality at about 10,000 people per year, or possibly as high as 12,000. Recent studies on wildfire PM 2.5 exposure suggest a mortality of double that: 24,000 all-cause deaths every year.
Needless to say, wildfire smoke is definitely not something you want to inhale if you can avoid it. (And really, you should try to.) But for the 115 million Americans in the Great Lakes and Northeast regions of the country who’ve been exposed to hazardous air from the fires in Ontario and Minnesota this week, there’s a chance that the damage is already done. According to a wildfire smoke mortality estimation tool from Cornell University’s School of Public Health and the Northeast Regional Climate Center, the total mortality for this smoke event could already be as high as 424 people so far, including nearly 100 in Michigan and more than 50 in both New York and Wisconsin.
Alistair Hayden, an assistant professor of practice in Cornell’s Department of Public and Ecosystem Health, stressed to me that the tool is a “first draft,” and that his team is still working on getting it peer-reviewed. “We intend it as a hypothesis that people can test in the coming weeks or months to confirm our numbers,” Hayden told me. “I’m really hoping to be proven wrong.”
But Hayden also emphasized that while the West Coast might historically be where many smoke-related deaths have occurred, “this is the third out of four years [in the Northeast] that we’re having the smoke, so it seems like something we should be planning for,” he said. “It reminds me of that saying: ‘Fool me once, shame on you. Fool me twice, shame on me.’”
Admittedly, the smoke this week is a bit of a freak occurrence. A cooler-than-average sea surface pattern across the North Pacific, known as a negative phase of the Pacific Decadal Oscillation, helped produce weak low-pressure areas in the northwestern part of the United States, which in turn allowed for heat domes to develop across the Southwest and Plains. After one did just that earlier this month, the hot, high-pressure dome then shifted north, where it developed “dryness across Canada, followed by the lightning-producing thunderstorms,” Chad Merrill, a senior meteorologist at AccuWeather, told me. Then, boom: widespread fires.
“It is very unusual to have a combination of an El Niño and a negative phase of the Pacific Decadal Oscillation,” Merrill went on. “That’s one of the unusual factors this year, which contributed to the heat dome being farther north in that particular position.” The heat dome and jet stream then worked together to direct the thick smoke down into some of the most populous regions of Canada and the U.S.
That’s what makes this particular smoke event so bad. Were the smoke blowing over remote regions of Canada, as it would under more usual conditions, “then the big cities and the Great Lakes wouldn’t experience the smoke; it would have gone north toward the Hudson Bay and then Greenland,” Merrill said. In fact, the Canadian fire season is tracking below average overall; it’s the meteorological conditions that made this week’s smoke events, as one outlet put it, “the perfect storm.”
Wildfire smoke in the region is not historically anomalous, however. A 1903 article in The New York Times describes a “yellow day” similar to smoky events in 1894, 1881, and earlier. But large-scale burns in Canada’s dense, remote boreal, which produce more smoke, are increasing. Though it’s difficult to attribute any one wildfire directly to climate change because of the complex nature of such events, we do know that fire weather is becoming more common with the warming of the atmosphere from greenhouse gas emissions. As modeled by Zeke Hausfather in the Friday edition of his newsletter The Climate Brink, “hotter, drier seasons burn the most” in Canada — and “recent years cluster there” as the country has outpaced the global average in warming.
But as Hausfather also writes, “While overall area burned is the climate-linked trend, who breathes the smoke on a given week in July is mostly driven by the weather.” This is similar to the way that, though it may be a quiet year in the Atlantic, it only takes one hurricane making landfall in the right (or wrong) spot for the season to be remembered as catastrophic.
On the other hand, as foolish as it might be for the Central Plains and East Coast to still believe smoke is the exclusive domain of Westerners, it is also a mistake to assume smoke only comes from without. As I reported earlier this year, the Eastern half of the country has seen a 10-fold jump in the frequency of large burns over the last 40 years. Nowhere is safe from the smoke.
Planning and preparation, then, should be paramount. But as Grist learned last month, there are no established Air Quality Index numbers that would trigger the postponement, relocation, or cancellation of, say, a FIFA World Cup game, including the final, which is set to be played in New Jersey on Sunday. White House officials are reportedly meeting with FIFA’s president on Friday to discuss contingencies, given the unhealthy air quality in the region.
Which brings us back to Hayden’s modeling. He offered a note of optimism in that research by Stanford’s Sam Heft-Neal and his colleagues indicates that emergency room visits do not rise in tandem with increasing wildfire smoke. “As smoke gets bad, the health impacts get bigger. But then as smoke gets worse and worse, the amount of health impacts actually goes down, measured for emergency room visits,” Hayden said. “The idea is that people modify their behavior in higher smoke” — say, by staying indoors, wearing masks, or canceling outdoor events.
It’s time to treat smoke as an East Coast phenomenon, in other words. Doing so will save lives. “Will [smoke events] become more frequent in the future? Most likely we will see a recurrence,” Merrill, the meteorologist, told me. “How often they happen is yet to be determined.”