How does rising atmospheric CO2 affect marine organisms?

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Cold Air Cave, Makapansgat Valley, South Africa
Holmgren, K., Tyson, P.D., Moberg, A. and Svanered, O. 2001. A preliminary 3000-year regional temperature reconstruction for South Africa. South African Journal of Science 97: 49-51.

Maximum annual air temperatures in the vicinity of Cold Air Cave (241'S, 2911'E) in the Makapansgat Valley of South Africa were inferred from a relationship between color variations in banded growth-layer laminations of a well-dated stalagmite and the air temperature of a surrounding 49-station climatological network developed over the period 1981-1995, as well as a quasi-decadal-resolution record of oxygen and carbon stable isotopes (MWP: AD 800-1100): Peak warmth of the Medieval Warm Period was as much as 2.5C warmer than the Current Warm Period (AD 1961-1990 mean).