How does rising atmospheric CO2 affect marine organisms?

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Grotta Savi, Southeast Alps of Italy
Frisia, S., Borsato, A., Spotl, C., Villa, I.M. and Cucchi, F. 2005. Climate variability in the SE Alps of Italy over the past 17,000 years reconstructed from a stalagmite record. Boreas 34: 445-455.

Working with stalagmite SV1 from Grotta Savi, a cave located at the southeast margin of the European Alps in Italy (45°37'05" N, 13°53'10" E), the authors developed a 17,000-year history of speleothem calcite δ18OC data, which they calibrated against measured air temperatures of the past 500 years. Based on the results presented in their Figure 6c and the δ18OC temperature relationship presented in their paper, it can be concluded that the peak warmth of the MWP (~900 AD) was slightly warmer than the mean temperature experienced here during the latter portion of the 20th century (1950 - 2000).