EPA Administrator Testifies At Senate Hearing On Carbon Pollution Standards

WASHINGTON, DC - JULY 23: U.S. Sen. David Vitter (R-LA) questions U.S. Environmental Protection Agency (EPA) Administrator Gina McCarthy during a Senate Environment and Public Works Committee on Capitol Hill, July 23, 2014 in Washington, DC. The committee heard testimony on EPA's proposed carbon pollution standards for existing power plants. (Photo by Mark Wilson/Getty Images)