In 2009, the Environmental Protection Agency released a historic Endangerment Finding, which concluded that six greenhouse gas emissions contribute to air pollution and endanger public health and well-being. This pollution is one of the key drivers of climate change, which can also result in more intense storms, increased drought and wildfires, and risks to human life.

The endangerment finding was reaffirmed in 2016, when the EPA finalized the rule for aircraft, stating that greenhouse gases from a variety of aircraft engines cause or contribute to air pollution that endanger public health and welfare. When these findings were released, it served as the legal and scientific basis for the EPA to issue regulations around emissions and other important health protections.

On March 12, 2025,

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