This 2007 photo released by Extreme Ice Survey shows James Balog installing a "cliff" camera at Columbia Glacier in Alaska for the film, "Chasing Ice." The film, about climate change, f

 

              This 2007 photo released by Extreme Ice Survey shows James Balog installing a "cliff" camera at Columbia Glacier in Alaska for the film, "Chasing Ice." The film, about climate change, f
This 2007 photo released by Extreme Ice Survey shows James Balog installing a "cliff" camera at Columbia Glacier in Alaska for the film, "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)