When the Intergovernmental Panel on Climate Change recently requested a figure for its annual report, to show global temperature trends over the last 10,000 years, the University of Wisconsin-Madison?s Zhengyu Liu knew that was going to be a problem. ?We have been building models and there are now robust contradictions,? says Liu, a professor in the UW-Madison Center for Climatic Research. ?Data from observation says global cooling. The physical model says it has to be warming.?
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