Nothing that right - wing politicians could do short of repealing the Clean Air Act could stop the EPA from
legally decarbonizing America's economy, if the EPA were to be given instructions by the Obama Administration to use its full legal authority in pursuing that goal.
Once again, the point to be made here is that the President, the Executive Branch, and the EPA already have all the tools they need to
legally and aggressively
decarbonize America's economy, assuming they are willing to use those tools to their maximum possible effectiveness.