How does rising atmospheric CO2 affect marine organisms?

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Lake Korttajarvi, Central Finland
Tiljander, M., Saarnisto, M., Ojala, A.E.K. and Saarinen, T.  2003.  A 3000-year palaeoenvironmental record from annually laminated sediment of Lake Korttajarvi, central Finland.  Boreas 26: 566-577.

Winter temperatures were inferred from analyses of varve thickness, relative X-ray density, pollen and diatom profiles and organic matter loss-on-ignition data obtained from annually-laminated sediments of Lake Korttajarvi (6220'N, 2541'E) in central Finland.  The Medieval Warm Period occurred between AD 980 and 1250 and was as much as 2C warmer than the Current Warm Period.