How does rising atmospheric CO2 affect marine organisms?

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Lake Korttajarvi, Central Finland
Reference
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.

Description
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 (62°20'N, 25°41'E) in central Finland.  The Medieval Warm Period occurred between AD 980 and 1250 and was as much as 2°C warmer than the Current Warm Period.