Greenland Ice Sheet 2008, 2 (IMAGE) University of California - Davis Caption The Greenland Ice Sheet (GIS) in 2008. The GIS appears highly sensitive to warming beyond 1 to 4 degrees Celsius beyond pre-Industrial levels. Its loss would contribute substantially to global sea level rise. In the decade since this photo was taken, the Arctic has already warmed by 0.75 degrees C. Credit Eric Post, UC Davis Usage Restrictions Provide credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.