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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.
"[A]ll the professional societies of climatologists, meteorologists, oceanographers that have ever looked at this problem have made very consistent statements that climate is changing, it's changing in unusual ways, and the only way that change can be explained is as a result of human activities. Most people have no idea that something between 95 and 100 % of climate scientists completely agree with that statement."