How does rising atmospheric CO2 affect marine organisms?

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Yakushima Island, Japan
Kitagawa, H. and Matsumoto, E. 1995. Climatic implications of δ13C variations in a Japanese cedar (Cryptomeria japonica) during the last two millennia. Geophysical Research Letters 22: 2155-2158.

The authors analyzed δ13C variations of Japanese cedars growing on Yakushima Island, southern Japan (3020'N, 13030'E), in an effort to reconstruct a high-resolution proxy temperature record over the past two thousand years. The Medieval Warm Period occurred between AD 800-1250 and from the authors' Figure 3, peak warmth during this time was about 1C above that of the Current Warm Period.