A Minnesota environmental group has released a list of the state's four power plants that produce the most carbon. A prevailing theory says that carbon dioxide trapped in the atmosphere contributes to rising temperatures.
The report named Xcel Energy's coal-fired Sherco Plant in Becker as the state's top carbon producer and the nation's 21st-biggest carbon-emitting plant. The Northland News Center reports that Duluth-based Minnesota Power's Boswell Energy Center in Cohasset is second on the state list.
The other coal-burning plants ranked by carbon emissions are Xcel's Allen S. King plant in Oak Park Heights and its Black Dog plant in Burnsville and Minnesota Power's Taconite Harbor Energy Center in Schroeder.
The federal Environmental Protection Agency is expected to propose new rules this month for cutting carbon pollution from new power plants.