How does rising atmospheric CO2 affect marine organisms?

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Mexican Highlands
Almeida-Lenero, L., Hooghiemstra, H., Cleef, A.M. and Van Geel, B. 2005. Holocene climatic and environmental change from pollen records of Lakes Zempoala and Quila, central Mexican highlands. Review of Palaeobotany and Palynology 136: 63-92.

The authors analyzed Holocene pollen profiles derived from sediment cores retrieved from Lake Zempoala (1903'N, 9918'W) and nearby Lake Quila (1904'N, 9919'W) in the central Mexican highlands about 65 km southwest of Mexico City. This work revealed that the period AD 700-900 was the "driest and represents an extreme since the mid-Holocene." In addition, the researchers note that climatic conditions near the end of this 200-year period (~AD 900) were similar to those of today, in particular as recorded in data from Lake Zempoala.