CO2 did come from oceans as they heated up at end of ice age cycles with significant contributions from eurasian swamps as well. (skepticalscience.com)
Artifacts, artistic depictions and human bone chemistry combine to show that fishing did not really get going until the Solutrean, and only became important in the Middle and especially the Late Magdalenian, at the very end of the Ice Age. (newscientist.com)
By this interpretation, it seems to me, nothing is more wrong than to treat the Human as though it has been biologically stationary since the ending of the Ice Age. (religion-online.org)