Grist: Hearing the news that a coal plant, a facility that once belched CO2, mercury, sulphur, nitrogen oxides, and other hazardous chemicals into the air, is shutting down is certainly a cause to celebrate. Seeing it explode in glorious high definition and set to lively classical music is another thing altogether. Duke Energy, the largest electric power holding company in the U.S., released a video this week showing the death of four of its old coal power plants, giving environmentalists an awesome soundtrack...