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It could be the ultimate test of human endurance: Three British explorers are risking their lives in subzero temperatures to measure the melting Arctic ice cap.

The team is on a three-month, 621-mile (1,000-kilometer) hike to their final destination at the North Pole. Along the way, taking precise measurements to determine exactly how fast the ice cap is disappearing.

"It's extremely difficult to live out here. It's very, very easy to get cold injuries in seconds," said Martin Hartley, team photographer and filmmaker, via satellite phone. Read full article »

All About United Nations Framework Convention on Climate ChangeArctic OceanNorth Pole

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