This 2009 photo released by Extreme Ice Survey shows photographer James Balog rappelling into Survey Canyon in Greenland during the filming of "Chasing Ice." The film, about climate change, follows Balog across the Arctic as he deploys revolutionary time-lapse cameras designed to capture a multi-year record of the world's changing glaciers. (AP Photo/Extreme Ice Survey, Jeff Orlowski)

Associated Press
This 2009 photo released by Extreme Ice Survey shows photographer James Balog rappelling into Survey Canyon in Greenland during the filming of "Chasing Ice." The film, about climate change, follows Balog across the Arctic as he deploys revolutionary time-lapse cameras designed to capture a multi-year record of the world's changing glaciers. (AP Photo/Extreme Ice Survey, Jeff Orlowski)
This 2009 photo released by Extreme Ice Survey shows photographer James Balog rappelling into Survey Canyon in Greenland during the filming of "Chasing Ice." The film, about climate change, follows Balog across the Arctic as he deploys revolutionary time-lapse cameras designed to capture a multi-year record of the world's changing glaciers. (AP Photo/Extreme Ice Survey, Jeff Orlowski)
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