How does rising atmospheric CO2 affect marine organisms?

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Gulf of Taranto, Ionian Sea
Cini Castagnoli, G., Taricco, C. and Alessio, S. 2005. Isotopic record in a marine shallow-water core: Imprint of solar centennial cycles in the past 2 millennia. Advances in Space Research 35: 504-508.

A δ13C profile of Globigerinoides rubber extracted from a shallow-water core in the Gulf of Taranto (3945'53"N, 1753'33"E) was used to produce a high-precision record of climate variability over the past two millennia. The Medieval Warm Period was described as an interval of high illumination (low cloud coverage) and high temperature between 800 and 1200 AD.