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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.
"Our habit to produce energy by burning fossil fuels causes global warming. Civil societies and policy makers will have to make a choice about how much climate change will be too much. Currently, the international community regards 2C as such a level, which is not safe, but which might prevent many of the more dramatic impacts."