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)
Bernard Goldstein, professor and dean emeritus of the Graduate School of Public Health at the University of Pittsburgh, testifies Feb. 1, 2012, before the Energy and Environment Subcommittee at the Rayburn House Office Building in D.C., about the EPA's approach to ground-water research in Pavillion, Wyo. (Barbara L. Salisbury/The Washington Times)
**FILE** President Obama talks with Environmental Protection Agency Administrator Lisa Jackson on Jan. 10, 2012, at EPA headquarters. (Associated Press)