You are utterly lost. Clinton passed laws saying coal plants needed to put stack filters on their plants. The plants sued. When Bush came in he dropped the suits and so....done. There were laws that forced plants to go to cleaner technology when they refitted or repaired plants.. The plants got congress to agree that it only counted when they rebuilt 35 percent or more. oddly, they never attained that level. So no cleaning. You really are a stupid human being, yet with such misplaced arrogance at the same time.
Yeah, I know you believe we have too much regulation. that is what the rightys and other low information believe. We don't have nearly enough. Here it is.
https://grist.org/article/2010-08-11-why-are-american-coal-plants-still-so-dirty/ You should be ashamed of yourself for swallowing corporate ,Repub shit so easily. Read something.