Methane concentrations in the enclosed air of the GRIP ice core from Greenland and the Byrd Station ice core from Antarctica.
Source: B. Stauffer et al., "Atmospheric CO2 Concentration and Millennial-Scale Climate Change During the Last Glacial Period," Nature Vol. 392 (March 5, 1998), pp. 59-62.
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Last modified by pib on October 28, 2003.