How does rising atmospheric CO2 affect marine organisms?

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Lake Huguangyan, Leizhou Peninsula, South China
Chu, G., Liu, J., Sun, Q., Lu, H., Gu, Z., Wang, W. and Liu, T.  2002.  The 'Mediaeval Warm Period' drought recorded in Lake Huguangyan, tropical South China.  The Holocene 12: 511-516.

A climatic history was derived from the geochemistry of dated sediments taken from Lake Huguangyan (219'N, 11017'E) on the Leizhou Peninsula of South China, as well as from information contained in historical documents.  The Medieval Warm Period occurred between AD 900 and 1300.