19 years ago, the Supreme Court told EPA it could regulate climate pollution. Trump is trying to undo that

By Ella Nilsen, CNN (CNN) — Last week, the Trump administration delivered a catastrophic blow to US climate policy by repealing the longstanding scientific finding that planet-warming pollution poses a danger to humans. Getting to this point was one of the administration’s most audacious deregulatory goals. But it doesn’t represent a complete success — yet.