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Supercomputer simulations of the Earth's most recent natural global warming (more than 14,000 years ago) show melting ice sheets and a 15-degree Celsius temperature spike over the course of a few centuries. Extended 200 years into our future, the simulations – led by University of Wisconsin-Madison climatologists – will provide insight on climate changes in our own time. Images credit: Jamison Daniel/National Center for Computational Sciences Date: July 2009
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