How does rising atmospheric CO2 affect marine organisms?

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Lake Nautajärvi, Finland
Ojala, A.E.K. and Alenius, T. 2005. 10,000 years of interannual sedimentation recorded in the Lake Nautajärvi (Finland) clastic-organic varves. Palaeogeography, Palaeoclimatology, Palaeoecology 219: 285-302.

The authors examined the physical properties of varves over the past 10,000 years from Lake Nautajärvi, Finland to produce a proxy record of winter precipitation and temperature. A period of very low catchment erosion and sediment transportation between 1000 and 1200 AD was interpreted by the authors as a period of attenuated spring floods caused by milder winters with considerably lower precipitation in the form of snow, which period they note "corresponds with the last historically recorded warm interval in Europe, known as the Medieval Climate Anomaly."