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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 John Cook original cartoon. Santa regrets not being more forward-thinking and supportive of clean energy long ago. But Santa takes the long view, and now he's onboard with renewables in hopes of retaining the ice cover at his new homes in Greenland and Antarctica.