How does rising atmospheric CO2 affect marine organisms?

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Shihua Cave, near Beijing, China
Qian, W. and Zhu, Y.  2002.  Little Ice Age climate near Beijing, China, inferred from historical and stalagmite records.  Quaternary Research 57: 109-119.

General climatic conditions were inferred from analyses of several data sets, one of which was a record of annual calcite accumulation in a stalagmite found in Shihua, Cave, Beijing.  The Medieval Warm Period occurred between AD 940 and 1200.