Politics / greenhouse gases EPA Declares CO2 a Pollutant Agency can regulate greenhouse gases under Clean Air Act By Nick McMaster, Newser Staff Posted Dec 7, 2009 3:35 PM CST Copied Environmental Protection Agency Administrator Lisa Jackson makes announcement on climate during a news conference in Washington, Monday, Dec. 7, 2009. (AP Photo/Manuel Balce Ceneta) It's official: the Obama administration today declared greenhouse gases a threat to public health, which will allow the agency to use the Clean Air Act to regulate emissions without congressional approval, the Washington Post reports. "There are no more excuses for delay," said EPA administrator Lisa Jackson, who will appear at the climate conference in Copenhagen this week. "This administration will not ignore science and the law any longer." (More greenhouse gases stories.) Report an error