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GLACIER NATIONAL PARK, UNITED STATES:  US Vice President Al Gore (R) and Dr., of the US Geological Survey, stand in front of Grinnell Glacier (C, left) and Salamander Glacier (C, top) 02 September at Glacier National Park, MT.  Gore traveled to the park to draw attention to the effects of global warming, which is hastening the melting of glaciers.   (ELECTRONIC IMAGE)    AFP PHOTO/Luke FRAZZACI (Photo credit should read LUKE FRAZZA/AFP/Getty Images)
GLACIER NATIONAL PARK, UNITED STATES:  US Vice President Al Gore (R) and Dr., of the US Geological Survey, stand in front of Grinnell Glacier (C, left) and Salamander Glacier (C, top) 02 September at Glacier National Park, MT.  Gore traveled to the park to draw attention to the effects of global warming, which is hastening the melting of glaciers.   (ELECTRONIC IMAGE)    AFP PHOTO/Luke FRAZZACI (Photo credit should read LUKE FRAZZA/AFP/Getty Images)

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    Al Gore's 40-year fight against global warming

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Al Gore's 40-year fight against global warming

Former Vice President Al Gore has been a climate change activist for over 40 years and has released two films on global warming

Al Gore's 40-year fight against global warming

Former Vice President Al Gore has been a climate change activist for over 40 years and has released two films on global warming