Figure 1. Changes in atmospheric carbon dioxide during the last 150,000 years recorded by the carbon dioxide content of air bubbles trapped in ice that accumulated on Antarctica.
(Barnola, J.-M., D. Raynaud, Y. S. Korotkevitch, and C. Lorius (1987) Vostok ice core provides 160,000-year record of atmospheric CO2. Nature 329, 408-414.)[back]
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