The new models predict that given a doubling in CO2 levels from pre-industrial levels, the Earth's surface temperatures will rise by 1.7C to 2.6C (3.1F to 4.7F).
That is a much tighter range than the one produced by the Intergovernmental Panel on Climate Change's (IPCC) 2007 report, which suggested a rise of between 2.0C to 4.5C.
The new analysis also reduces the expected rise in average surface temperatures to just over 2C, from 3C
Journal Science - Climate Sensitivity Estimated from Temperature Reconstructions of the Last Glacial Maximum
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