Overturning a Legal Bedrock: The Repeal of the Endangerment Finding

An analysis of how the Endangerment Finding was overturned and the resulting implications.

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Published April 20th, 2026

Written by Macy Goldfarb

The History and Repeal of the Endangerment Finding

The Endangerment Finding is a pivotal determination that concluded greenhouse gases are harmful and must be federally regulated. The legal origins of the Endangerment Finding can be traced to the Supreme Court’s 2007 decision in Massachusetts v. Environmental Protection Agency (EPA), in which the Supreme Court sided with the EPA and declared greenhouse gases as air pollutants under the Clean Air Act. The Supreme Court established the EPA’s authority to determine whether greenhouse gases pose a threat to public health. Through this ruling, the Supreme Court issued the EPA full legal responsibility to regulate greenhouse gas pollutants. This laid the groundwork for the Obama Administration to create the Endangerment Finding in 2009, which identified six greenhouse gases as dangers to public health.

According to the BBC, the Endangerment Finding has served as a “legal bedrock” that has allowed successive presidential administrations to control emissions and hold industries accountable. The regulatory action’s influence has been powerful and far-reaching, affecting the automobile sector, oil and gas industries, power plants, landfills, and airplanes. By establishing legal responsibility for these sectors, the Endangerment Finding has been foundational in the fight against climate change.

Despite its critical importance, the EPA overturned the Endangerment Finding on February 12, 2026. This action aligns with the administration’s prior statements on environmental regulation. CNBC reports that President Trump has repeatedly called climate change both a “con job” and a “hoax,” and he campaigned on expanding oil drilling and reducing environmental oversight. On the first day of his second term, Trump signed an executive order directing the EPA to issue a report on the Endangerment Finding. As outlined in BBC, President Trump wrongfully characterized the environmental protection policy as legislation that “severely damaged the American auto industry and massively drove up prices for American consumers.” However, this repeal has raised significant legal questions concerning its validity and the resulting impact on both climate change and the nation’s health. 

Legal or Illegitimate?

According to The Salata Institute at Harvard University, the proposal to repeal the Endangerment Finding criticized the administrative determination for overlooking the benefits of emitting industries and emphasized the uncertainties of climate change, deeming it “unduly pessimistic.” Similar arguments were proposed during the Bush administration but were rejected due to credible scientific research linking greenhouse gas emissions to health risks. Thus, this repeal is unprecedented and lacks credible evidence to support it. Premised on these critiques, the legal basis for the repeal centers on the EPA’s authority to control greenhouse gas emissions under the Clean Air Act. The agency now interprets the law to prohibit regulation of motor vehicle emissions on the grounds that such emissions do not substantially impact air quality nor public health and that regulation would be expensive and ineffective.

This repeal is monumental, removing the federal government’s legal responsibility to regulate pollutants and protect public health, and raising the stakes for environmental legislation. Moreover, if the repeal remains, it could set a precedent that makes future regulation of greenhouse gases nearly impossible. According to the World Resources Institute, it also would eliminate prior justifications for grant programs that sought to lower emissions. Multiple lawsuits have already been filed by health and environmental justice non-profit organizations. According to The Guardian, Gretchen Goldman, president of the Union of Concerned Scientists, an organization part of the lawsuit against the EPA, proclaims, “this shameful and dangerous action by the Trump administration and EPA administrator Zeldin is rooted in falsehoods, not facts, and is at complete odds with the public interest and the best available science.” Therefore, the EPA has reinterpreted the Clean Air Act in an scientifically unsound manner to overturn the Endangerment Finding, but it is unclear whether this repeal will withstand the pending litigation. If it does, the question shifts to how individual states will respond to protect the climate.

The Consequences of the Repeal

The repeal of the Endangerment Finding carries extensive environmental, public health, and financial consequences. According to The Guardian, President Trump called the Endangerment Finding “the single largest deregulatory action in American history”. In response to questions regarding the public health and environmental impacts, Trump reportedly stated “don’t worry about it because it has nothing to do with public health.” Scientific evidence contradicts this assertion. According to the New York Times, a 136-page report by the new National Academies illustrated that there is growing evidence that greenhouse gasses threaten health. Therefore, despite President Trump’s claims, the harmful impacts of greenhouse gasses are scientifically indisputable, and the repeal has large negative externalities for public health.

A significant problem is that the repeal will exacerbate climate change. Rising global temperatures are expected to increase extreme weather events, such as wildfires, hurricanes, tornados, and droughts. These conditions, combined with more greenhouse gasses in our atmosphere, will degrade air quality. As outlined in BBC, research from the Environmental Defense Fund indicates that this repeal will cause an increase of up to 58,000 premature deaths and 37 million more asthma attacks. Poor air quality is also associated with higher rates of heart disease. These environmental and public health impacts will translate into financial burdens, and it’s likely that there will be higher costs for insurance, healthcare, food, water, and electricity. According to CNBC, an American born in 2024 will pay around $500,000 in climate-related costs over their life. Thus, any savings from lower gas, energy, and transportation prices are far outweighed by these profound financial expenses.

Paradoxically, the repeal may create unforeseen challenges for the fossil industry. Although it initially appears beneficial for oil and gas companies, according to The Guardian, climate-related lawsuits against Big Oil have previously been dismissed as the Endangerment Finding preempted legal issues. As a result, the Endangerment Finding acted as a legal blockade. Without the federal legislative framework, major oil companies may face increased litigation and liability, and states will be responsible for handling these cases.

 The negative implications of the Endangerment Finding repeal are vast and profound. With the Trump administration and the EPA dismissing scientific evidence and public health concerns, the fight now falls to the lawsuits filed by health and environmental justice non-profits. According to Earthjustice, these organizations sued the EPA over its determination that it is no longer responsible for regulating greenhouse gases and protecting the public from their harmful health effects. Additionally, as outlined in the BBC, 23 states and 17 cities, counties, and agencies have filed lawsuits in the U.S. Court of Appeals challenging the overturning of the Endangerment Finding. These lawsuits are the last line of defense in ensuring that federal regulations against environmental threats are enforced. Alarmingly, the cases’ outcomes could determine whether Americans retain meaningful protections against the harmful impacts of greenhouse gases and climate change, leaving the health and safety of future generations hanging precariously in the balance.

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