Birthday Canyon in Greenland
This 2009 photo released by Extreme Ice Survey shows Birthday Canyon in Greenland furing the filming of “Chasing Ice.” The film, about climate change, follows National Geographic photographer James Balog across the Arctic as he deploys revolutionary time-lapse cameras designed to capture a multi-year record of the world’s changing glaciers. Birthday Canyon is approximately 150 feet deep. (AP Photo/Extreme Ice Survey, James Balog)
