The Trump administration is weighing whether to repeal the “endangerment finding,” which states that greenhouse gases pose a threat to public health and welfare.

EPA pushes White House to ignore scientific finding that helped form current climate policy - The 2009 finding says carbon dioxide and other greenhouse gas emissions threaten public health

The head of the Environmental Protection Agency has privately urged the Trump administration to reconsider a scientific finding that's long been the central basis for U.S. action against climate change.