Professional Paper 1386–A
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Figure 1–3. Variation in concentration of carbon dioxide in the Earth’s atmosphere for the previous six glacial/interglacial cycles (past 650,000 years), from analyses of the ice core taken by the European Project for Ice Coring in Antarctica (EPICA) from Dome C, Antarctica. The concentration of carbon dioxide in the atmosphere in 2009 was 390 ppmv.