The highest it has been in 400,000 years is about 300 ppmv.
Is climate change happening? Yes
Are humans partially responsible? Yes
Can we do anything about it? Probably not
Is there a profitable opportunity in coming cataclysm? Surely there is!
Figure 2.22: Variations of temperature, methane, and atmospheric carbon dioxide concentrations derived from air trapped within ice cores from Antarctica (adapted from Sowers and Bender, 1995; Blunier et al., 1997; Fischer et al., 1999; Petit et al., 1999).25 years.
http://www.grida.no/publications/other/ipcc_tar/?src=/climate/ipcc_tar/wg1/095.htm
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