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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.
Summary of observational evidence that human carbon dioxide emissions are causing the climate to warm (described here and here). Also see the many articles that link to the earlier version of this graphic.