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In page IPCC Fourth Assessment Report:

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Global warming projections from AR4[1] are shown below. The projections apply to the end of the 21st century (2090–2099), relative to temperatures at the end of the 20th century (1980–1999). Add 0.7 °C to projections to make them relative to pre-industrial levels instead of 1980–1999. (UK Royal Society, 2010, p=10[citation needed]).[2] Descriptions of the greenhouse gas emissions scenarios can be found in Special Report on Emissions Scenarios.