How does rising atmospheric CO2 affect marine organisms?

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Yakushima Island, Southern Japan
Reference
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.

Description
Based on δ13C data from a two-millennia-long tree-ring record of Japanese cedars growing on Yakushima Island, southern Japan (30°20'N, 130°30'E), the authors identify the Medieval Warm Period as an interval of high temperature between 800 and 1200 AD.