Working on the Greenland Ice Sheet (IMAGE) University of Copenhagen - Niels Bohr Institute Caption Hans Christian Steen-Larsen is wearing climbing equipment in minus 40 degrees at Summit on the ice sheet. Credit (Credit: David Schneider, NCAR) Usage Restrictions (Credit: David Schneider, NCAR) 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.