How does rising atmospheric CO2 affect marine organisms?

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Nansen Fjord, Eastern Greenland
Jennings, A.E. and Weiner, N.J. 1996. Environmental change in eastern Greenland during the last 1300 years: evidence from foraminifera and lithofacies in Nansen Fjord, 68N. The Holocene 6: 179-191.

Benthic foraminifera and lithofacies analyses were conducted on two marine sediment cores from Nansen Fjord, eastern Greenland (~68.25N, 29.6W), in an effort to infer changes in sea-ice conditions and water masses in this region since AD 730. Results of the analyses revealed the presence of a Medieval Warm Period that occurred between about AD 730 and 1110. The authors describe the climate during this time as "the warmest and most stable in the last millennium including the present day," in which sea-ice in the fjord was "never or rarely" present in the summer.