How does rising atmospheric CO2 affect marine organisms?

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Lake Nakatsuna, Japan
Adhikari, D.P. and Kumon, F. 2001. Climatic changes during the past 1300 years as deduced from the sediments of Lake Nakatsuna, central Japan. Limnology 2: 157-168.

Sediment cores from Lake Nakatsuna in central Japan (3630'N, 13751'E) were analyzed for total organic carbon, total nitrogen and sand content to produce a proxy record of climate for this region over the past 1300 years. The MWP was identified by the authors as an interval between 900 and 1200 AD that was "warmer than any other period during the last 1300 years."