How does rising atmospheric CO2 affect marine organisms?

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Sea of Azov
Matishov, G.G., Novenko, E.Yu. and Krasnorutskaya, K.V. 2012. Late Holocene climate changes in the Sea of Azov region. Doklady Earth Sciences 444: 656-660.

Working with two sediment cores obtained from the southeast (45°41'09"N, 37°19'17"E) and northeast (46°39'55"N, 38°00'34"E) portions of the Sea of Azov, and "based on the relationship between the subfossil pollen assemblages and the modern climatic settings," Matishov et al. were able to identify four phases of warm and dry climates (before 3200, 2500-1800, 1500-650 and after 150 cal. years BP) and three phases of relatively cool and humid climates (3200-2500, 1800-1500 and 650-150 cal. years BP); and of these time periods, the 1500-650 cal. years BP interval represents the Medieval Warm Period (MWP = AD 450-1300).