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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.
"We know that the world is warming, we've known that for a long time. We know that much of that warming, in fact the overwhelming majority of that warming is due to human activity, that is the combustion of fossil fuels and other GHGs going into the atmosphere."