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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.
How much the climate warms up depends on the total amount of CO2 emissions, not just the CO2 in a year, or a decade. The rate of heating is usually measured over long periods because short term measurements may be misleading.