U.S. President George W. Bush signs energy bill in Washington

U.S. President George W. Bush (L) shares a laugh with Speaker of the House Nancy Pelosi (D-CA) prior to signing the Energy Independence and Security Act of 2007 during a ceremony at the U.S. Department of Energy in Washington on December 19, 2007. The 822-page measure includes the first congressional increase in vehicle fuel-economy standards in 32 years. (UPI Photo/Shawn Thew/POOL)