
Environmental Protection Agency Administrator Lisa P. Jackson gives an interview to The Associated Press at the agency's headquarters in Washington on Tuesday, April 17, 2012. (Associated Press)

Environmental Protection Agency Administrator Lisa P. Jackson gives an interview to The Associated Press at the agency's headquarters in Washington on Tuesday, April 17, 2012. (Associated Press)

EPA Administrator Lisa P. Jackson said the agency's new rule that will limit toxic pollutants released by coal- and oil-fired power plants is the Obama administration's "biggest clean-air action yet." (Associated Press)

Associated Press EPA chief Lisa P. Jackson says greenhouse gases threaten the health of Americans and contribute to climate change.

In this image released by the White House, President Obama receives a briefing in the Situation Room of the White House on the BP oil spill in the Gulf of Mexico, on Wednesday, July 21, 2010. Taking part in the meeting are, clockwise from top; Homeland Security Secretary Janet Napolitano, National Incident Commander Adm. Thad Allen, Environmental Protection Agency Administrator Lisa P. Jackson, U.S. Cost Guard Rear Adm. Peter Neffenger, Press Secretary Robert Gibbs, Interior Secretary Ken Salazar, NOAA Administrator Jane Lubchenco, Energy Secretary Steven Chu and Chief of Staff Rahm Emanuel. (AP Photo/Pete Souza)