Associated Press: Duke Energy’s newest coal-fired power generator will pump more than 5 million tons of carbon dioxide into the North Carolina sky every year. And environmentalists are outraged because of concerns over global warming. But their fight now centers on a few dozen pounds of toxic mercury that the plant will emit. Mercury can damage the brains of developing fetuses and very young children. And environmentalists see mercury as an undisputed threat to the public’s health. They hope the …