How does rising atmospheric CO2 affect marine organisms?

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Great Bahama Bank, Straits of Florida
Lund, D.C. and Curry, W. 2006. Florida Current surface temperature and salinity variability during the last millennium. Paleoceanography 21: 10.1029/2005PA001218.

Lund and Curry reconstructed surface temperatures of the Florida Current near the Great Bahama Bank (2445.5'N, 7917.5'W) from Mg/Ca measurements of the fossil shells of the surface-dwelling foraminifer Globigerinoides rubber found in a sediment core taken from a depth of approximately 700 meters. This work indicated that the peak surface temperature of the MWP (AD 740-880) was approximately 0.25C greater than that of the upper segment of the core, which was deposited "primarily after AD 1950."