Environmental regulations should only be put in place if they actually have a meaningful effect on the problem they intend to solve. I have yet to see any environmental regulation proposals concerning climate change - in the U.S. or anywhere else - that do anything other than destroy economies for no meaningful benefit if accepting current climate models of NOAA or IPCC. Further, China is a large elephant in the room, an authoritarian state that does as it pleases, including burning coal to meet its energy needs. International "agreements" have no effect on China.
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