America's Dirtiest Power Companies, Ranked
Coal-fired power plants are the single biggest driver of global climate change in the United States. That's why President Barack Obama's Environmental Protection Agency is moving quickly to put the finishing touches on a new set of regulations, called the Clean Power Plan, that aim to reduce the nation's overall carbon footprint 30 percent by 2030 by cracking down on emissions from the energy sector.
http://www.motherjones.com/environment/2015/07/dirtiest-power-companies-climate-change
Duke Energy