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endangerment finding
1,000+ Experts Rip EPA for 'Reckless Dismissal of Established Climate Science'
Repealing the endangerment finding, they wrote, "is contrary to science and the public interest."
Sep 16, 2025
More than 1,000 scientists and other experts on Tuesday sent a letter to US Environmental Protection Agency Administrator Lee Zeldin explaining why they "strenuously object" to his effort to repeal the EPA's 2009 "endangerment finding," which has enabled federal climate regulations over the past 15 years.
Amid mounting fears that he would take such action, Zeldin in late July unveiled the rule to rescind the landmark legal opinion that greenhouse gases endanger public health and the welfare of the American people—part of Republican President Donald Trump's broader pro-polluter agenda.
"As climate scientists, public health experts, and economists, we can attest to the indisputable scientific evidence of human-caused climate change, its harmful impacts on people’s health and well-being, and the devastating costs it is imposing on communities across the nation and around the world," states the new letter, organized by the Union of Concerned Scientists. "This explicit attempt to undermine or weaken these findings, as well as the critical regulations linked to them, is contrary to science and the public interest."
"We also strongly oppose the EPA’s reckless dismissal of established climate science as part of its proposal to repeal the endangerment finding, including the agency’s heavy reliance on an unscientific study commissioned by the Department of Energy. This report is rife with inaccuracies, deliberately cherry-picks and mischaracterizes data, and has not undergone a rigorous scientific review process," the letter continues, echoing an expert review of the government report from earlier this month.
🚨NEW: Scientists from nearly every state, DC, and Puerto Rico are calling out Trump's Environmental Protection Agency for failing to fulfill their core duties: protect the environment and public health.
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— Union of Concerned Scientists (@ucs.org) September 16, 2025 at 11:17 AM
Citing major US and global analyses, along with thousands of independent, peer-reviewed scientific studies, the letter stresses that "the scientific evidence on human-caused climate change and its consequences was unequivocal in 2009 and, since that time, has become even more dire and compelling."
It says that "based on the best available science," scientists know:
- Climate change poses severe harms to human health and well-being;
- Climate change is clearly increasing the likelihood of extreme events; and
- The economic toll of climate change is rising.
Harms to human health and well-being include higher rates of heat-related deaths, increased spread of some infectious diseases, and decreased food and water safety due to climate-fueled extreme weather events, the letter says. It also highlights that, according to data from the National Oceanic and Atmospheric Administration (NOAA), "billion-dollar disasters in the United States are on the rise, driven by a combination of climate factors and increased development in disaster-prone areas."
Despite such findings, the Trump administration is making various moves to boost the planet-wrecking fossil fuel industry and the president withdrew the United States from the Paris Agreement—again—when he returned to office in January. Parties to the 2015 climate agreement aim to limit global temperature rise this century to 1.5°C above preindustrial levels.
🌎🧪Over 1,000+ scientists joined together to defend the EPA's Endangerment Finding, and you have SIX DAYS to make your voice heard too.
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— Union of Concerned Scientists (@ucs.org) September 16, 2025 at 11:17 AM
"The world stands on the cusp of breaching the 1.5°C (2.7°F) mark on a long-term basis, the global average temperature increase above preindustrial levels that scientists have long warned about," the experts noted Tuesday. "Communities across the nation are already dealing with devastating and costly climate impacts, that are set to worsen as global warming accelerates. Humanity's window to act to stave off some of the worst impacts of climate change is fast closing; any further delay is harmful and costly."
"We urge you to stop dismantling critical climate regulations and evading EPA's responsibility by pushing disinformation about climate science and impacts," they concluded. "Instead, we call on you to act with urgency to help address this pressing challenge by limiting heat-trapping emissions. People across the nation are relying on the EPA to fulfill its mission to protect public health and the environment."
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'A Mockery of Science': Experts Slam Trump DOE's Climate Report in New Paper
"The goal is clear," said one of the experts. "To justify inaction and avoid meaningful emissions reductions."
Sep 02, 2025
The US Department of Energy's July climate report is "biased, full of errors, and not fit to inform policymaking," according to a comprehensive review released Tuesday by a group of 85 scientists who reviewed the document independently.
The department's "Climate Working Group" drew up the report as part of the effort by US President Donald Trump to fatally undermine the Environmental Protection Agency's (EPA) determination, commonly known as the "endangerment finding," that greenhouse gases like carbon dioxide and methane endanger human lives by warming the planet.
"If successful," Andrew Dessler, a climate scientist at Texas A&M, says, "this move could unravel virtually every US climate regulation on the books, from car emissions standards to power plant rules."
The Energy Department's nearly 150-page paper, titled "A Critical Review of the Impacts of Greenhouse Gas Emissions on the US Climate." Dessler describes its five authors as "climate contrarians who dispute mainstream science." The team behind the report, he argues, was "hand-picked" by Energy Secretary Chris Wright to lend legitimacy to the Trump administration's predetermined conclusions about climate science.
The DOE report's five authors seek to contradict the much more rigorous analyses conducted by groups like the Intergovernmental Panel on Climate Change (IPCC), whose reports have been written by over a thousand researchers and which cite tens of thousands of academic studies.
The multinational panel has concluded that human fossil fuel usage has considerably warmed the planet, causing increased amounts of extreme weather, threatening food and water security, destroying ecosystems, and risking dangerous amounts of sea-level rise.
The Energy Department's report advances the main idea that climate scientists like those at the IPCC broadly "overstate" the extent of the human-caused climate crisis as well as its risks. Unlike other research of its kind, the department crafted its report in secret, which prompted the expert response.
"Normally, a report like this would undergo a rigorous, unbiased, and transparent peer review," said Dr. Robert Kopp, a climate and sea-level researcher at Rutgers. "When it became clear that DOE wasn't going to organize such a review, the scientific community came together on its own, in less than a month, to provide it."
Their review found that the Energy Department's report "exhibits pervasive problems with misrepresentation and selective citation of the scientific literature, cherry-picking of data, and faulty or absent statistics."
For instance, the report claims that there is "no obvious acceleration in sea-level rise" even though the number of days of high-tide coastal flooding per year has increased more than 10-fold since the 1970s.
It also attempts to portray CO2 emissions as a net benefit to the environment, particularly agriculture, by pointing to its benefits for crop growth, but ignores that the impact of increased droughts and wildfires far outweighs those benefits.
And it attempts to pick out isolated historical weather events like the Dust Bowl during the 1930s as evidence that dramatic climatic changes happen very frequently within short amounts of time and that the unprecedented increase in global temperatures over the past century and a half is not worthy of alarm.
"My reading of the report uncovered numerous errors of commission and omission, all of which slant toward a conclusion that human-caused climate change poses no serious risks," said Kerry Emmanuel, a meteorologist and climate scientist who specializes in hurricane physics. "It seems to work backward from a desired outcome."
Dessler notes that over 99% of the literature included in the IPCC's report was simply ignored by the Department of Energy. He described the report as a "mockery of science" akin to a "Soviet show trial."
"The outcome of this exercise by the Department of Energy is already known: climate science will be judged too uncertain to justify the endangerment finding," he said. "Once you understand that, everything about the DOE report makes total sense."
In 2025, the US National Weather Service issued a record number of flash flood warnings, while 255 million Americans were subject to life-threatening triple-digit temperatures in June. The previous year, 48 of 50 US states faced drought conditions, the most ever recorded in US history, while nearly 9 million acres burned due to wildfires.
"We live in a world where the impacts of climate change are increasingly being felt by citizens all around the globe—including communities throughout the US," said Andra Gardner, a professor of environmental science at Rowan University.
"This is perhaps what makes the DOE Climate Working Group report most astounding," she continued. "In a country where we have the tools to not only understand the impacts of climate change but also to begin meaningfully combating the crisis, the current DOE has instead decided to promote fossil fuel interests that will further worsen the symptoms of climate change with a report that turns a blind eye to the established science."
According to an analysis from Climate Power published in January, oil and gas industry donors gave $96 million in direct donations to the campaign of Donald Trump and affiliated super PACs during the 2024 election, while spending $243 million to lobby Republicans in Congress.
The result has been an administration that has purged climate science information from federal websites, laid off thousands of EPA employees, and gutted government funding for wind and solar energy.
Becca Neumann, an associate professor in the Civil and Environmental Engineering Department at the University of Washington, says that "the goal" of the report "is clear: to justify inaction and avoid meaningful emissions reductions."
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The Trump Admin's Climate Denial Proposal Contradicts Science, Law, and Public Opinion
The world’s highest court recently affirmed that climate action is a legal duty and that governments must regulate greenhouse gas emissions.
Aug 24, 2025
When US Environmental Protection Agency, or EPA, Administrator Lee Zeldin announced last month his official proposal to rescind the agency’s foundational determination that greenhouse gas emissions endanger human health and welfare, he insinuated that previous administrations (under former Presidents Barack Obama and Joe Biden) had “twisted the law, ignored precedent, and warped science” in order to achieve their regulatory agendas. And the regulations of these planet-warming emissions, not the emissions themselves like carbon dioxide, are “the real threat to Americans’ livelihoods,” Zeldin suggested.
EPA’s greenhouse gas endangerment finding, established in 2009, serves as the basis of its legal obligation under the Clean Air Act to regulate greenhouse gas (GHG) emissions from sources such as motor vehicles and power plants. The finding was based on an extensive review of the scientific record, which has gotten even more robust over the last 16 years, and has survived all legal challenges brought against it.
The Trump administration’s move to do away with the finding contradicts the overwhelming scientific evidence that greenhouse gas emissions are driving dangerous climate change impacts. There are also arguments to be made that it is unlawful. And, it goes against the pleas of the hundreds of Americans who have spoken out this week in opposition to Zeldin’s sweeping deregulatory proposal. In other words, contrary to Zeldin’s assertion, it is actually the Trump administration that is twisting or ignoring the law and public sentiment and warping science.
Let’s start with the science. The world’s premier body of climate scientists—the Intergovernmental Panel on Climate Change—has stated that it is “unequivocal” that human activities are warming the planet and causing rapid and widespread changes, such as more extreme weather, that are unprecedented over millennia. The US Fifth National Climate Assessment report observes that “harmful impacts from more frequent and severe extremes are increasing across the country” and notes that “climate changes are making it harder to maintain safe homes and healthy families; reliable public services; a sustainable economy; thriving ecosystems, cultures, and traditions; and strong communities.” These are authoritative statements from reports involving hundreds of scientists and extensive peer review.
What the Trump administration is doing with repealing the endangerment finding and all GHG regulations that flow from it, therefore, could be a violation of international law under the ICJ’s recent advisory opinion.
But to support its proposal to rescind the endangerment finding, Trump’s EPA relies instead on a new report issued by the Department of Energy (DOE) that rejects the scientific consensus on climate change and claims that GHG emissions and climate impacts are not harmful. The report, hastily written by five climate skeptics over a period of just two months, recycles many climate denialist talking points and, according to one analysis, includes over 100 false or misleading statements. As science historian Naomi Oreskes puts it, “Climate denial is now the official policy of the US government.”
“What the Trump administration and the Department of Energy did is pull together this small hand-picked group of people to work in secret to write this report that questions that mountain of scientific evidence that climate change is harming people,” said Erin Murphy, a senior attorney at Environmental Defense Fund (EDF).
“In and of itself, the conclusions of that report are inaccurate and inconsistent with the vast, vast majority of scientific findings and the consensus across the scientific community,” she added. “But also, the report is inconsistent with federal law.”
EDF and the Union of Concerned Scientists have filed a lawsuit against the DOE, the EPA, and the group of five climate skeptics arguing that the secretive manner in which the report was pulled together violates the Federal Advisory Committee Act, which mandates transparency and opportunities for public engagement in government advisory proceedings.
The report has not gone through formal peer review, and although it is currently open to public comment, the time window for commenting is limited to just 30 days (closing on September 2) during a month when many people take vacations or might otherwise be unavailable. And until this week, none of the hundreds of comments that have come in were publicly visible. That hiding of the comments, Murphy said, “further underscores the government’s efforts to do this in secret.”
The lawsuit aims to block the Trump administration from using this report in its efforts to rescind the endangerment finding.
It was clear to me that the speakers—from environmental groups, the medical community and scientists to municipal and state governments and private citizens—were overwhelmingly united in their disapproval of the nixing of EPA’s foundational finding that GHG emissions endanger our health and welfare.
Even if EPA plows ahead and finalizes its move to eliminate the finding, that action will certainly be challenged in court. It remains to be seen what legal arguments environmental groups and other challengers will put forth.
One thing that is clear is that climate action is no longer optional, but rather a legal obligation, as several international courts have affirmed in recent landmark climate change advisory opinions. The International Court of Justice, considered the world’s highest court, delivered its opinion on July 23. The ICJ clarified that states have obligations under multiple sources of international law to reduce emissions and that governments must regulate the emissions of private actors. The customary law duty to prevent significant environmental harm to the climate system, which applies to all countries regardless of whether they are parties to specific treaties, includes putting in place “regulatory mitigation mechanisms” to reduce GHG emissions, the court said. Such rules “must regulate the conduct of public and private operators.” According to the court, failure to act in good faith to regulate emissions could be considered an unlawful act.
What the Trump administration is doing with repealing the endangerment finding and all GHG regulations that flow from it, therefore, could be a violation of international law under the ICJ’s recent advisory opinion. And while the opinion itself is nonbinding, it may be invoked in domestic court proceedings around the world, including in the US.
Zeldin’s endangerment finding rescission also seems to be untenable in the court of public opinion. “In repealing the endangerment finding, the Trump administration is stepping far out of line with public opinion, as voters across partisanship are in strong agreement that greenhouse gas emissions are a threat to public health and should be regulated,” Data for Progress says in reference to new poll results it released last week.
EPA held virtual public hearings last week on its proposal, and almost everyone who testified spoke in opposition to eliminating the endangerment finding. Out of the roughly 200 people who spoke on Tuesday, fewer than 10 voiced support for EPA’s rollback, Inside Climate News reports. I tuned into some of the hearings on Wednesday and Thursday, and it was clear to me that the speakers—from environmental groups, the medical community and scientists to municipal and state governments and private citizens—were overwhelmingly united in their disapproval of the nixing of EPA’s foundational finding that GHG emissions endanger our health and welfare.
“The EPA has a responsibility to regulate greenhouse gases for what they are—a clear, present, and growing threat to the health and well-being of every American,” Kim Cobb, a climate scientist, told the EPA panel in concluding her testimony.
Tiffany Covarrubias Lyttle, a registered nurse and mother of seven children, said during her testimony that the father of her children recently passed away from cancer, specially an environmentally triggered adenocarcinoma.
“Repealing environmental protections and rescinding [the endangerment] finding will make stories like mine more common,” Lyttle said. “Clean air, clean water, and a stable climate aren’t just environmental issues. They are in fact a matter of life and death.”
This piece was originally published on Dana Drugmand’s Substack One Earth Now on August 21, 2025.
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