How does rising atmospheric CO2 affect marine organisms?

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Paradise Lake, Tawang District, Arunachal Pradesh, India
Bhattacharyya, A., Sharma, J., Shah, S.K. and Chaudhary, V. 2007. Climatic changes during the last 1800 yrs BP from Paradise Lake, Sela Pass, Arunachal Pradesh, Northeast Himalaya. Current Science 93: 983-987.

The authors developed a history of atmospheric warmth and moisture covering the last 1800 years for Paradise Lake in the Northeastern Himalaya (2730.324'N, 9206.269'E), based on pollen and carbon isotopic (δ13C) analyses of a one-meter-long sediment profile they obtained from a pit "dug along the dry bed of the lakeshore." This work revealed a "warm and moist climate, similar to the prevailing present-day conditions," around AD 240, as well as another such period that turned out to be "more warmer [our italics] 1100 yrs BP (around AD 985) corresponding to the Medieval Warm Period".