Proposed regulations would require power plants, factories and refineries to reduce greenhouse gases by installing the best available technology and improving energy efficiency whenever a facility is significantly changed or built.These large sources are responsible for 70 percent of the greenhouse gas emissions — mainly carbon dioxide from burning fossil fuels — that are released in the U.S., the EPA said.

"By using the power and authority of the Clean Air Act, we can begin reducing emissions from the nation's largest greenhouse gas-emitting facilities without placing an undue burden on the businesses that make up the vast majority of our economy," EPA Administrator Lisa Jackson said. "We know the corner coffee shop is no place to look for meaningful carbon reductions."
See pictures of the effects of global warming.

Earlier this year, the Obama administration announced it would start developing the first-ever greenhouse gas emissions standards for cars and trucks. Those regulations, which would take effect in 2010, compel the EPA to control greenhouse gases from large smokestacks as well, the agency said.

Industry groups immediately questioned the agency's argument. They charged that the EPA was skirting the law, since the Clean Air Act typically covers any facility releasing more than 250 tons a year of a recognized pollutant. That threshold would require more facilities to fall under the new regulations. "This proposal incorrectly assumes that one industry's greenhouse gas emissions are worse than another's," said Charles T. Drevna, president of the National Petrochemical and Refiners Association.