Washington Post: The Supreme Court on Monday left intact a key Obama administration environmental regulation, refusing to take up an appeal from 20 states to block rules that limit the emissions of mercury and other harmful pollutants that are byproducts of burning coal.
The high court’s decision leaves in place a lower-court ruling that found that the regulations, put in place several years ago by the Environmental Protection Agency, could remain in effect while the agency revised the way it had calculated the…

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