WASHINGTON - APRIL 24:  Former Vice President Al Gore testifies while flanked by former Senator John Warner (D-VA) during House Energy and Environment Subcommittee hearing on Capitol Hill April 24, 2009 in Washington, DC. The Subcommittee is hearing testimony on the Clean Energy Security Act of 2009. Getty Images logo Getty Images 7 months ago

WASHINGTON - APRIL 24: Former Vice President Al Gore testifies while flanked by former Senator John Warner (D-VA) during House Energy and Environment Subcommittee hearing on Capitol Hill April 24, 2009 in Washington, DC. The Subcommittee is hearing testimony on the Clean Energy Security Act of 2009.