The Washington Post reports:

So that’s the lay of the land. Outside observers basically think that the EPA’s new rules could cut power-plant emissions anywhere from 1 percent to 26 percent. It all depends on how the administration juggles environmental considerations with concerns about legality and cost.

A 26% reduction in U.S. coal plant emissions — about 500 million tons/year — is meaningless means since annual manmade emissions are projected to rise to about 45 billion tons by 2040 — a 46% increase from 2010.