How does rising atmospheric CO2 affect marine organisms?

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Northwest Spain Peat Bog
Martinez-Cortizas, A., Pontevedra-Pombal, X., Garcia-Rodeja, E., Novoa-Muņoz, J.C. and Shotyk, W.  1999.  Mercury in a Spanish peat bog: Archive of climate change and atmospheric metal deposition.  Science 284: 939-942.

Mean annual temperatures were inferred from a record of mercury deposition in a peat bog in northwest Spain (43°32'N, 7°34'W) spanning the last 4000 radiocarbon years.  The Medieval Warm Period occurred between AD 1000 and 1200 and the mean annual temperature during this time was as much as 3.4°C warmer than that of the 1968-98 period.