** FILE ** This photo April 17, 2012, file photo shows Environmental Protection Agency (EPA) Administrator Lisa Jackson during an interview with The Associated Press at EPA Headquarters in Washington. Jackson, The Obama administration's chief environmental watchdog, is stepping down after a nearly four-year tenure marked by high-profile brawls over global warming pollution, the Keystone XL oil pipeline, new controls on coal-fired plants and several other hot-button issues that affect the nation's economy and people's health. (AP Photo/Kevin Wolf, File)