Are polar ice sheets shrinking? Report offers definitive answer at last. Pictured is the meltwater flow through Greenland's Birthday Canyon. According to this report, Greenland is losing 5x as much ice annually as it did in the 1990's - CSMonitor.com
Global warming is melting the Greenland Ice Sheet, fast
Mario Tama/Getty Images Antarctica A section of the West Antarctic Ice Sheet with mountains is seen from a window of a NASA Operation IceBridge airplane on Oct. 28 during one of a set of research flights to study the ice sheet.
Active volcano discovered under Antarctic ice sheet