How does rising atmospheric CO2 affect marine organisms?

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New Zealand Cave
Reference
Wilson, A.T., Hendy, C.H. and Reynolds, C.P.  1979.  Short-term climate change and New Zealand temperatures during the last millennium.  Nature 279: 315-317.

Description
Temperatures derived from an 18O/16O profile through a stalagmite found in a New Zealand cave (40.67°S, 172.43°E) revealed the Medieval Warm Period to have occurred between AD 1050 and 1400 and to have been 0.75°C warmer than the Current Warm Period.