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

Pollution causes more illness and early death than any other environmental threat, accounting for one in six deaths worldwide. For decades, the US Environmental Protection Agency's (EPA) Office of Research and Development (ORD) has driven many of the biggest advances for safeguarding human health and ecosystems from chemicals.