How does rising atmospheric CO2 affect marine organisms?

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Daihai Lake, Inner Mongolia
Reference
Zhangdong, J., Ji, S., Sumin, W. and Eniou, Z. 2002. The Medieval Warm Period in the Daihai Area. Hupo Kexue 14: 209-216.

Description
The authors used rubidium/strontium ratio, calcium carbonate and organic concentration data of sediments cored from Daihai Lake in Inner Mongolia (112°38'E, 40°33'N) to reconstruct the climate of that region over the past 2,200 years. The results indicated the existence of a "warm and humid" climate that defined the Medieval Warm Period between AD 800 and 1100, which also exhibited the "strongest chemical weathering during the last 2,200 years."