This July 17, 2011 photo shows the melting front of a glacier at the edge of the Greenland ice sheet, near Kangerlussuaq, Greenland. Greenland is the focus of many researchers trying to determine how ... more 
This July 17, 2011 photo shows the melting front of a glacier at the edge of the Greenland ice sheet, near Kangerlussuaq, Greenland. Greenland is the focus of many researchers trying to determine how much its melting ice may raise sea levels. (AP Photo/Brennan Linsley) less 
1 / 1
Associated Press | Photo By Brennan Linsley
Sun, Aug 14, 2011 8:46 AM EDT