EcoWatch: One of the dirtiest coal-fired power plants in the U.S. will soon shut down, thanks to a well-known billionaire and previously passed legislation. As part of its acquisition of Nevadas largest utility, NV Energy, Warren Buffetts Berkshire Hathaway also inherited Reid Gardner, a 557-megawatt (MW), coal-fired energy plant near Las Vegas. The massive structure, which has a history of recognition among the countrys dirtiest carbon polluters, wont be a lasting legacy of NVs profile. NV plans on...