EPA
EPA finalizes rescission of 2009 greenhouse-gas endangerment finding for motor vehicles, setting up major legal fight
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The Environmental Protection Agency has finalized a rule rescinding its 2009 finding that greenhouse gases from new motor vehicles endanger public health and welfare, a step the agency says eliminates its authority under the Clean Air Act to set greenhouse-gas standards for cars and trucks. The action—grounded in a new legal interpretation and the Supreme Court’s “major questions” doctrine—has drawn sharp criticism from Democrats and legal and scientific experts and is expected to face court challenges.
The U.S. Environmental Protection Agency released data in February 2026 indicating that the average fuel economy for new vehicles reached a record 27.2 miles per gallon in 2024. Tesla led all automakers with an average of 118 mpg, benefiting from sales of electric vehicles, while Honda ranked second at 31 mpg. The findings come amid moves by the Trump administration to roll back federal emission standards.
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The Environmental Protection Agency has proposed revisions to the Clean Water Act that would restrict tribes' and states' ability to review federal projects for water quality impacts. Experts warn this could undermine treaty rights and sovereignty for Native American nations. The changes revert to narrower oversight established before 2023.