(041309 Cambridge, MA) Congressman Edward J. Markey (pointing) moderates the Clean Power - Building a New Clean Energy Economy conference at M.I.T. Sitting at right are Dr. Daniel Yergin, Chairman of the Cambridge Energy Research Associate

(041309 Cambridge, MA) Congressman Edward J. Markey (pointing) moderates the Clean Power - Building a New Clean Energy Economy conference at M.I.T. Sitting at right are Dr. Daniel Yergin, Chairman of the Cambridge Energy Research Associates, Inc. and Dr. Ernest Moniz, MIT Cecil and Ida Green Professor of Physics and Engineering Systems; Director of the MIT Energy Initiative, took part in the first session called Energy and Global Warming: TMonday, April 13, 2009. Staff photo by Ted Fitzgerald (Photo by Ted Fitzgerald/MediaNews Group/Boston Herald via Getty Images)