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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.
"Climate change is a fact and humans are very likely responsible for most of it. Long term impacts will mostly be negative. On the positive side: Costs of mitigation, that is to reduce emissions, are smaller than those for prevented damages."