LAS VEGAS - AUGUST 10: Former U.S. Vice President Al Gore (L) and U.S. Department of Labor Secretary Hilda Solis attend the National Clean Energy Summit 2.0 at the Cox Pavilion at UNLV August 10, 2009 in Las Vegas, Nevada. Political and economic leaders are attending a two-day summit to discuss a domestic policy agenda to advance alternative energy for the country's future.