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Researchers have resolved a conflict in estimates of how much the Earth will warm in response to a doubling of carbon dioxide in the atmosphere. That conflict - between temperature ranges based on global climate models and paleoclimate records and ranges generated from historical observations - prevented the United Nations' Intergovernmental Panel on Climate Change (IPCC) from providing a best estimate in its most recent report for how much the Earth will warm as a result of a doubling of CO2 emissions. [Source: Harvard University]
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