How does rising atmospheric CO2 affect marine organisms?

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Feni Drift, Rockall Trough, Northeast Atlantic Ocean
Richter, T.O., Peeters, F.J.C. and van Weering, T.C.E. 2009. Late Holocene (0-2.4 ka BP) surface water temperature and salinity variability, Feni Drift, NE Atlantic Ocean. Quaternary Science Reviews 28: 1941-1955.

The authors obtained high-resolution (22-year average) planktonic foraminiferal Mg/Ca and stable oxygen isotope (δ18O) data from a pair of sediment cores retrieved from the northeast Atlantic Ocean's Feni Drift, Rockall Trough region (5539.02'N, 1359.10'W and 5539.10'N, 1359.13'W) from which they derived late-Holocene (0-2.4 ka BP) sea surface temperatures (SSTs). This work revealed the MWP to have occurred between approximately AD 750 and 1160; and a plot of the results (shown below) reveals the peak temperature of the MWP to have been about 2.3C greater than the peak temperature of the late 20th century.

Sea surface temperature history of the northeast Atlantic's Feni Drift region, adapted from Richter et al. (2009).