President Donald Trump’s administration has proposed revoking a scientific finding that's long been the central basis for U.S. action to regulate greenhouse gas emissions and fight climate change.

On Tuesday the U.S. Environmental Protection Agency released its proposal to undo its long-standing rationale and legal mandate to regulate greenhouse gases under the decades-old Clean Air Act—part of the Trump administration’s wide-ranging campaign to dismantle federal efforts to combat climate change.

The Environmental Protection Agency’s endangerment finding is one of the most consequential environmental regulations in recent U.S. history. President Donald Trump’s administration this week proposed revoking the finding,