Laurie David

"An Inconvenient Truth" producer Laurie David, the ex-wife of comedian Larry David, right, is an ardent environmentalist who has written a book on global warming and led a 500,000-person "virtual march" on Washington. Here she joined Sheryl Crow and Florida Gov. Charlie Crist before the Stop Global Warming concert in Gainesville, Fla., on April 16, 2007.

Credit: AP