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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 illustration compares the use of coal for energy and sequestering it's CO2 emissions to M.C. Escher's infinite staircase. The comparison was suggested by Skeptical Science author Sarah, illustrated by John Garrett (Skeptical Science author jg), and used in Sarah's post: