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. 1997 Aug 5;94(16):8343–8349. doi: 10.1073/pnas.94.16.8343

Figure 3.

Figure 3

(Upper) CO2 vs. time before present, as inferred by Etheridge et al. (17) from ice core studies. (Lower) CH4 vs. time before present, as inferred by Etheridge et al. (19) from ice core studies.