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.

Most of the United States’ major climate regulations are underpinned by one important document: It’s called the endangerment finding, and it concludes that greenhouse gas emissions are a threat to human health and welfare.

The Trump administration's EPA, or Environmental Protection Agency, has announced a proposal to overturn 2009's Endangerment Finding, which forms the basis of key climate action initiatives as well as curbs on carbon emissions.