How does rising atmospheric CO2 affect marine organisms?

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Lake Redon, Central Pyrenees, Northeast Spain
Pla, S. and Catalan, J. 2005. Chrysophyte cysts from lake sediments reveal the submillennial winter/spring climate variability in the northwestern Mediterranean region throughout the Holocene. Climate Dynamics 24: 263-278.

The authors analyzed chrysophyte cyst data collected from a sediment core obtained from Lake Redon (42.64N, 0.77E) in the Central and Eastern Pyrenees of northeast Spain, producing a history of winter/spring temperatures for this region throughout the Holocene. The Medieval Warm Period (~ AD 875 to 1000) was categorized as the "warmest period" of the record, with temperatures about 0.25C warmer than it is currently.