How does rising atmospheric CO2 affect marine organisms?

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Thorndycraft, V.R. and Benito, G. 2006. The Holocene fluvial chronology of Spain: evidence from a newly compiled radiocarbon database. Quaternary Science Reviews 25: 223-234.

The authors compiled and analyzed a database of Holocene radiocarbon dates from fluvial deposits throughout Spain (~ 40N, 1W) in an effort to identify episodes of increased fluvial activity. A period of increased frequency of large magnitude floods occurred between AD 700 and 1160 and "appear to coincide with the Medieval Warm Period."