How does rising atmospheric CO2 affect marine organisms?

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Mount Kenya, Eastern Africa
Karlén, W., Fastook, J.L., Holmgren, K., Malmström, M., Matthews, J.A., Odada, E., Risberg, J., Rosqvist, G., Sandgren, P., Shemesh, A. and Westerberg, L.-O. 1999. Glacier fluctuations on Mount Kenya since ~ 6000 cal. years BP: Implications for Holocene climatic change in Africa. Ambio 28: 409-418.

The authors examined radiocarbon-dated lacustrine sediments, cored from mountain lakes formed by cirque glaciers on Mount Kenya (~ 0.15°S, 37.3°E), to produce a record of glacier advances throughout the past 6,000 years. The results indicated six major periods of glacier advances, the two most recent of which occurred between AD 650 and 850 and between AD 1350 and 1550. Because these advances were "attributed primarily to changes in temperature," we identify the Medieval Warm Period as the warmer interval between the two most recent cooling-induced glacial advances, i.e., AD 850-1350.