How does rising atmospheric CO2 affect marine organisms?

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Qipisarqo Lake, Southern Greenland
Kaplan, M.R., Wolfe, A.P. and Miller, G.H. 2002. Holocene environmental variability in southern Greenland inferred from lake sediments. Quaternary Research 58: 149-159.

The authors analyzed Holocene climatic variability from a small lake in southern Greenland. The reconstruction was based on various physical and chemical properties of a lake sediment core obtained from Qipisarqo Lake (61.01N, 47.75W), including magnetic susceptibility, density, water content, biogenic silica concentration, and organic matter concentration. Results indicate that neoglacial cooling began around 2000 years ago, but was interrupted by two reversals, one between 650 and 1050 AD (the Medieval Warm Period) and another between 1450 and 1670 (the Little Medieval Warm Period). Based upon biogenic silica data plotted by the authors in their Figures 4 and 5 (Figure 5 reproduced below), from which relative temperature can be inferred, it is clear that the current warm period has not attained the warmth of Medieval times.