How does rising atmospheric CO2 affect marine organisms?

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Lake Teletskoye, Altai Mountains, Southern Siberia, Russia
Kalugin, I., Daryin, A., Smolyaninova, L., Andreev, A., Diekmann, B. and Khlystov, O. 2007. 800-yr-long records of annual air temperature and precipitation over southern Siberia inferred from Teletskoye Lake sediments. Quaternary Research 67: 400-410.

The authors collected several sediment cores from the deepest area of Teletskoye Lake (5139'N, 8740'E) in the Altai Mountains of southern Siberia, for which they measured the spectra of numerous elements - including Ba, Cd, Ce, I, La, Mo, Nb, Rb, Sb, Sn, Sr, Th, U, Y, Zr - after which "artificial neural networks were used for reconstruction of annual temperature and precipitation by sediment properties." This work revealed that the mean peak temperature of the latter part of the Medieval Warm Period was about 0.5C higher than the mean peak temperature of the Current Warm Period.