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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.
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"…we routinely look not only at land and ocean surface temperature. We look at ice coverage. We look at ice thickness. We look at the amount of water vapor in the atmosphere. We look at surface pressure patterns. We look at upper ocean heat content. We look at continental scale runoff from major rivers. We look at many, many different aspects of climate change and they're telling us an internally and physically consistent story. The message in that story is natural causation alone can't explain the observed changes that we see."