A contributor to the famous «hockey stick graph», he specialises in mining historic climate data from polar ice cores. (climatechangenews.com)
Past changes in atmospheric greenhouse gas concentrations can be determined with very high confidence from polar ice cores. (metlink.org)
The U.S. first started drilling deep polar ice cores in Greenland in 1956, with more drilling at Antarctica's Byrd Station a few years later. (psmag.com)