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Caption: The 2009 Goldman Prize recipients at the Prize ceremony in San Francisco - April 20, 2009
Credit: Courtesy of the Goldman Environmental Prize

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Caption: The 2009 Goldman Prize recipients on stage at the Prize ceremony in San Francisco - April 20, 2009
Credit: Courtesy of the Goldman Environmental Prize

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Caption: Performer Tracy Chapman on the green carpet at the 2009 Goldman Prize ceremony in San Francisco - April 20, 2009
Credit: Courtesy of the Goldman Environmental Prize

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Caption: Performer Tracy Chapman and CNN Chief International Correspondent Christiane Amanpour on the green carpet at the 2009 Goldman Prize ceremony in San Francisco - April 20, 2009
Credit: Courtesy of the Goldman Environmental Prize

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Caption: Al Gore and Prize winners on the green carpet at the 2009 Goldman Prize ceremony in San Francisco - April 20, 2009
Credit: Courtesy of the Goldman Environmental Prize

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Caption: Al Gore and Prize winners on the green carpet at the 2009 Goldman Prize ceremony in San Francisco - April 20, 2009
Credit: Courtesy of the Goldman Environmental Prize

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Caption: Al Gore with the Prize winners on the green carpet at the 2009 Goldman Prize ceremony in San Francisco - April 20, 2009
Credit: Courtesy of the Goldman Environmental Prize

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Caption: Christiane Amanpour on the green carpet at the 2009 Goldman Prize ceremony in San Francisco - April 20, 2009
Credit: Courtesy of the Goldman Environmental Prize

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Caption: Robert Redford on the green carpet at the 2009 Goldman Prize ceremony in San Francisco - April 20, 2009
Credit: Courtesy of the Goldman Environmental Prize

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Caption: Robert Redford with Richard Goldman and family on the green carpet at the 2009 Goldman Prize ceremony in San Francisco - April 20, 2009
Credit: Courtesy of the Goldman Environmental Prize

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Caption: Al Gore giving a keynote speech at the 2009 Goldman Prize ceremony in San Francisco - April 20, 2009
Credit: Courtesy of the Goldman Environmental Prize

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Caption: Al Gore with Richard Goldman at the 2009 Goldman Prize ceremony in San Francisco - April 20, 2009
Credit: Courtesy of the Goldman Environmental Prize

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Caption: Christiane Amanpour with Richard Goldman at the 2009 Goldman Prize ceremony in San Francisco - April 20, 2009
Credit: Courtesy of the Goldman Environmental Prize

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Caption: Christiane Amanpour with Robert Redford at the 2009 Goldman Prize reception in San Francisco - April 20, 2009
Credit: Courtesy of the Goldman Environmental Prize