How does rising atmospheric CO2 affect marine organisms?

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Yakushima Island, Southern Japan
Cini Castagnoli, G., Taricco, C. and Alessio, S.  2005.  Isotopic record in a marine shallow-water core: Imprint of solar centennial cycles in the past 2 millennia.  Advances in Space Research 35: 504-508.

Based on δ13C data from a two-millennia-long tree-ring record of Japanese cedars growing on Yakushima Island, southern Japan (3020'N, 13030'E), the authors identify the Medieval Warm Period as an interval of high temperature between 800 and 1200 AD.