How does rising atmospheric CO2 affect marine organisms?

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Saki Lake, Crimean Peninsula, Ukraine
Reference
Solomina, O., Davi, N., D'Arrigo, R. and Jacoby, G. 2005. Tree-ring reconstruction of Crimean drought and lake chronology correction. Geophysical Research Letters 32: L19704, doi:10.1029/2005GL023335.

Description
A sediment core from Saki Lake (~ 45.2°N, 33.5°E) on the Crimean Peninsula, Ukraine, revealed that "the wettest period of the past 1500 years (~AD 1050-1250) broadly coincides with the 'Medieval Warm Period' in Crimea."