Upholding EPA’s Global Warming Endangerment Finding

The Environmental Protection Agency has determined that human activities are driving climate change, which poses a major threat to our planet. This finding has been unsuccessfully challenged by the fossil fuel industry and its allies. Earthjustice helped defend the EPA’s finding to ensure that climate progress is not reversed.

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Case Overview

Earthjustice is co-counsel for Environmental Defense Fund, opposing industry lawsuits challenging the U.S. EPA’s scientific finding that global warming pollution endangers the public. In 2009, the EPA determined that emissions of greenhouse gases from new motor vehicles contribute to pollution that causes climate change, which in turn threatens human health and the environment.

In 2010, this finding led the EPA to issue the first-ever U.S. federal greenhouse gas emission standards for cars and trucks. These standards will prevent emissions of nearly one billion tons of carbon dioxide and other greenhouse gases.

Industry’s challenges to the endangerment finding and vehicle standards were rejected in 2012 by the U.S. Court of Appeals for the District of Columbia Circuit, and in 2013, the Supreme Court rejected industry’s effort to overturn that D.C. Circuit ruling.

In 2009, EPA determined that emissions of greenhouse gases from new motor vehicles contribute to pollution that causes climate change.
In 2009, EPA determined that emissions of greenhouse gases from new motor vehicles contribute to pollution that causes climate change. (Photo courtesy of Steven Worster.)

Case Updates

Cars and trucks move along the Cross Bronx Expressway, a notorious stretch of highway in New York City that is often choked with traffic and contributes to pollution and poor air quality on November 16, 2021 in New York City. (Spencer Platt / Getty Images)
April 8, 2026 Press Release

Environmental Groups Sue EPA For Illegal Repeal of Climate Protections

Environmental groups and Alaskan tribes challenge the Trump EPA’s unlawful repeal of the endangerment finding and elimination of vehicle emissions standards

A freeway full of cars in morning sunlight.
March 26, 2026 Article

As Doctors See the Costs of Climate Change, Trump Plays a Deadly Game of Denial

The administration's repeal of a key scientific finding on climate will harm millions.

A flock of birds fly past a smokestack of a coal-fired power plant.
February 18, 2026 feature

Trump is Failing the Climate Test. Will You Pass Our Climate Quiz?

See how well you understand what the Trump administration is up to