A decade ago, as part of a concerted effort to reign in industrial pollution, the Obama-era Environmental Protection Agency (EPA) promulgated the mercury and air toxics standards (MATS) pursuant to its authority under the Clean Air Act (CAA). The purpose, as implied by the title, was to limit the amount of mercury and other toxins released into the air by coal-fired power plants. It was heralded by proponents and environmentalists as a large step forward in reducing the risk of heart attacks and cancer, and …
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