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All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. 941-954. Cambridge University Press.
"But our expectations of future warming are not based on extrapolation of recent trends. Rather, we expect climate to be warmer in the future than in the past because we know that greenhouse gases absorb and then re-emit thermal radiation. As people around the world burn more and more fossil fuels, concentrations of greenhouse gases increase, so that solar energy accumulates under the extra absorbing gas. Scientists expect accumulating heat to cause warming temperatures because we know that when we add heat to things, they change their temperatures."