Climate change feedbacks are processes in the climate system that either augment or diminish the systems response to a climate forcing. The increase in atmospheric greenhouse gases is an anthropogenic forcing that increases the temperature of the surface. This recent increase in surface temperatures and its projected continuation is called global warming. The International Panel on Climate Change in its fourth assessment reported a climate sensitivity to be likely in the range of 2 to 4.5 °C for a doubling of atmospheric carbon dioxide. The uncertainty is largely due to differences in the how different global climate models incorporate and parameterize each of the climate feedbacks.
From http://en.wikipedia.org/
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