U.S. President-elect Barack Obama (R) looks on as Steven Chu, director of Lawrence Berkeley National Lab, speaks after being introduced as Obama's Energy Secretary nominee during a news conference in Chicago, December 15, 2008.  (Xinhua/Reuters Photo) Photo Gallery>>>

U.S. President-elect Barack Obama introduces Nobel physics laureate Steven Chu (2nd-L) as Energy Secretary and Nancy Sutley (L) current Deputy Mayor for Energy and Environment for the City of Los Angeles, as Chair of the White House Council on Environmental Quality during a news conference in Chicago, December 15, 2008.  (Xinhua/Reuters Photo) Photo Gallery>>>