The correct response to Chevron being overturned is for every single environmental group to start filing millions of lawsuits, right now, today, arguing that various regulatory decisions didn't go far enough.
Absolutely flood the zone.
Just take every public comment period submission by Greenpeace or Ducks Unlimited or literally any one that the EPA hasn't fully implemented and demand the courts rule.
File everything in the 9th circuit.
Play their game.
