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U.S. top court invalidates Obama administration mercury air pollution rule

By Lawrence Hurley WASHINGTON (Reuters) – The U.S. Supreme Court on Monday invalidated a key Obama administration environmental regulation aimed at limiting emissions of mercury and other hazardous pollutants mainly from coal-fired power plants.     The court ruled in a 5-4 decision, with its five conservative justices in the majority, that the U.S. Environmental Protection Agency should have weighed the cost of compliance in deciding whether to regulate the pollutants.