EPA has finalized the Rescission Rule, the rescission of the greenhouse gas Endangerment Finding. EPA called it the “single largest deregulatory action in U.S. history.” Administrator Zeldin announced EPA’s intention to rescind the Endangerment Finding in March 2025 when he announced a series of sweeping deregulatory actions.

The genesis of the Endangerment Finding was an October 1999 petition for rulemaking submitted to EPA by various environmental organizations seeking regulation of greenhouse gases. The petition was based on Clean Air Action Section 202(a)(1), which states that EPA shall prescribe standards applicable to the emission of any air pollutant from new vehicles or engines “which in his judgment cause, or contribute to, air pollution which may reasonably be anticipated to endanger public health or welfare.”

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