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Scientists at the National Center for Atmospheric Research and the University of Colorado in Boulder, using actual measurements, concluded Arctic sea ice has declined at an average rate of about 7.8 per cent a decade between 1953 and 2006.
By contrast, 18 computer models used by the Intergovernmental Panel on Climate Change, a United Nations-sponsored climate research group, estimated an average rate of decline of 2.5 per cent a decade over the same period, the researchers said.
They said the discrepancy between their observations and computer projections indicate computer models may have failed to portray the entire impact of increasing levels of greenhouse gases such as carbon dioxide in the atmosphere."