How does rising atmospheric CO2 affect marine organisms?

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Ge, Q., Wang, S., Wen, X., Shen, C. and Hao, Z. 2007. Temperature and precipitation changes in China during the Holocene. Advances in Atmospheric Sciences 24: 1024-1036.

Ge et al. reviewed proxy temperature records of China that span the entire Holocene, while providing greatest emphasis on the last 2000 years. Their evaluation of this prior work indicated that "during the past two millennia, a warming trend in the 20th century was clearly detected, but the warming magnitude was smaller than the maximum level of the Medieval Warm Period," which they describe as having occurred between AD 900 and 1300.