Dorthe Dahl-Jensen is a geology professor at Copenhagen's Neils Bohr Institute. She also leads the latest international team drilling a deep ice core in the Greenland Ice Sheet. Here she talks about "abrupt changes" that have been discovered in past climates, by studying other ice cores. In some cases, average temperatures in Greenland appear to have changed by 10 or 15 degrees centigrade in a matter of a few decades. She says she wants to figure out if such large-scale changes could be caused today by increased warming. This interview took place in her office during the Copenhagen Climate Conference.
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