Episode Details

For nearly two decades, the EPA’s 2009 Endangerment Finding has served as a legal foundation for federal regulation of greenhouse gas emissions. Its history begins with the Supreme Court’s 2007 decision in Massachusetts v. EPA, continues through the Obama administration’s Endangerment Finding, and extends through the greenhouse gas regulations adopted under subsequent administrations.

In February 2026, the Trump EPA rescinded the Endangerment Finding as it applied to motor vehicles and repealed the federal greenhouse gas standards that followed from it. In September, EPA finalized a major repeal of greenhouse gas requirements for fossil-fuel-fired power plants while proposing to rescind the remaining greenhouse gas findings and regulations governing the power sector.

What does all of this mean for federal climate regulation?

In this episode, we trace the legal history behind the Endangerment Finding, examine the scientific and regulatory arguments surrounding it, and explain how a provision of the Clean Air Act became the foundation for decades of federal greenhouse gas regulation. We also examine what the 2026 EPA actions actually changed, what remains in place, and what Congress, the courts, states, and future administrations could still do.

The Endangerment Finding has been at the center of the legal battle over greenhouse gas regulation for years. Understanding its history helps explain why its reversal represents such a significant shift in federal environmental policy—and why the future of that policy remains unsettled.

https://www.epa.gov/climate-change/endangerment-and-cause-or-contribute-findings-greenhouse-gases-under-section-202a

https://apnews.com/article/epa-power-plants-trump-coal-gas-climate-cac1c2c75f8656d8eaf5f0a240edae15

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