How does rising atmospheric CO2 affect marine organisms?

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York, England
Addyman, P.V., Hood, J.S.R., Kenward, H.K., MacGregor, A. and Williams, D. 1976. Palaeoclimate in urban environmental archaeology at York, England: problems and potential. World Archaeology 8: 220-233.

The authors report that the remains of several species of beetle (whose northern limits are presently south of Yorkshire) were found in medieval archaeology deposits in York, England. Based upon the present range limits of these species, a paleoproxy of relative temperature was deduced from which they concluded that the presence of these insects "provides by far the best evidence for temperatures above those of the present day [our italics] during the Roman as well as early medieval periods."