How does rising atmospheric CO2 affect marine organisms?

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GRIP Ice Core, Greenland Summit
Johnsen, S.J., Dahl-Jensen, D., Gundestrup, N., Steffensen, J.P., Clausen, H.B., Miller, H., Masson-Delmotte, V., Sveinbjörnsdottir, A.E. and White, J. 2001. Oxygen isotope and palaeotemperature records from six Greenland ice-core stations: Camp Century, Dye-3, GRIP, GISP2, Renland and NorthGRIP. Journal of Quaternary Science 16: 299-307.

Palaeotemperature estimates were obtained by Monte Carlo inversion techniques from a GRIP (72.58°N, 37.63°W) borehole temperature profile obtained near the summit of the Greenland Ice Cap. From the results plotted in the authors' Figure 6, it can be seen that temperatures during the Medieval Warm Period (~AD 800-1100) were about 1°C warmer than those of the Current Warm Period.