How does rising atmospheric CO2 affect marine organisms?

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New Zealand's Western South Island
Lorrey, A., Williams, P., Salinger, J., Martin, T., Palmer, J., Fowler, A., Zhao, J.-X. and Neil, H. 2008. Speleothem stable isotope records interpreted within a multi-proxy framework and implications for New Zealand palaeoclimate reconstruction. Quaternary International 187: 52-75.

A master speleothem δ18O record (which is a proxy for temperature) was developed for New Zealand's western South Island for the period 2000 BC to about AD 1825 from data acquired from four speleothems of Aurora, Calcite, Doubtful Xanadu and Waiau caves. This record revealed that the warmest time interval of the nearly 4000 years occurred between about AD 900 and 1100. Because the record did not extend beyond AD 1825, however, we cannot compare peak MWP warmth with peak CWP warmth.