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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.
"The climate's always changing. So there's no doubt that climate changes. The real question is why is it changing and how much of it if any is attributable to human behaviour."
"You can argue, you know, that the world is the globe is warming as it always has for natural reasons but I think the way indicates, at least some of it, you can argue whether it’s 1/2% or something more substantial, you know, is caused by human behavior. "