The U.S. Supreme Court on Tuesday agreed to review the first-ever national environmental standards requiring power plants to reduce emissions of mercury and other toxic air pollutants, saying it would decide whether the government should have considered how much the rules would cost utilities. The court’s action extends a saga that dates back more than two decades. Congress first required the Environmental Protection Agency to issue regulations in 1990, but the agency’s efforts had been stalled for years because of several factors, including lengthy court battles. The EPA rules, adopted in 2012, require coal and oil-fired power plants to cut most of their emissions of mercury, a neurotoxin the EPA says is particularly harmful for children, unborn babies and women […]