EPA Proposes Rescinding the 2009 Endangerment Finding. Power and Oil Markets Feel It Through Vehicles First

On July 29, 2025, the Environmental Protection Agency released a proposed rule to rescind the 2009 endangerment finding, the determination under Section 202 of the Clean Air Act that greenhouse gas emissions from new motor vehicles contribute to air pollution that may reasonably be anticipated to endanger public health and welfare. The proposal would also repeal all federal greenhouse gas emission standards for light-, medium- and heavy-duty vehicles and engines. It was published in the Federal Register on August 1.

The EPA said the proposed action would save Americans about $54 billion a year under what it described as conservative forecasts, through lower vehicle costs. The endangerment finding was issued in December 2009, following the Supreme Court's 2007 decision in Massachusetts v. The finding has served as the legal foundation for greenhouse gas regulation of vehicles. The proposal also questions aspects of the scientific basis for the original finding, citing a report from a group of researchers commissioned by the Department of Energy.

The proposal is open for public comment, and the agency has scheduled public hearings. Taken together, these changes reduce regulatory pressure on automakers to shift toward electric vehicles in the US market. California's ability to set its own vehicle standards, under a waiver granted by the EPA, was revoked by Congress through the Congressional Review Act earlier in 2025. The endangerment finding for vehicles does not directly govern power plant emissions. States remain able to pursue their own climate policies within their authority.

For automakers, the proposal adds to uncertainty about the long-term regulatory environment, which matters for investment decisions in battery plants and electric vehicle production lines that run over a decade or more. For international climate negotiations, the proposal reinforces the US shift away from federal climate regulation, following the withdrawal from the Paris Agreement announced in January. The comment period, the EPA's response and the timing of a final rule are the next steps.