NASA scientists fly over Greenland to track melting ice

The fields of rippling ice 500 feet below the NASA plane give way to the blue-green of water dotted with irregular chunks of bleached-white ice, some the size of battleships, some as tall as 15-story buildings. Like nearly every other glacier on Greenland, the massive Kangerlussuaq is melting. NASA scientist Josh Willis is now closely studying the phenomenon in hopes of figuring out precisely how global warming is eating away at Greenland's ice.