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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.
This diagram summarizes the various methane sources from a warming Arctic described by Skeptical Science author Andy Skuce in his four-part series Subcap Methand Feedbacks.
This drawing appears in Part 1 (Fossil methane seepage in Alaska and Part 4 (Speculations) of the series.