How does rising atmospheric CO2 affect marine organisms?

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Lake Biwa, Central Japan
Goto, S., Hamamoto, H. and Yamano, M. 2005. Climatic and environmental changes at southeastern coast of Lake Biwa over past 3000 years, inferred from borehole temperature data. Physics of the Earth and Planetary Interiors 152: 314-325.

The authors reconstructed the ground surface temperature history from a borehole off the southern coast of Lake Biwa, the largest and oldest lake in Japan, to produce a proxy climate record spanning the past 3000 years. The Medieval Warm Period was described as a period of warmth from the 8th to the 12th century A.D. Comparison of the magnitude of warmth during the Medieval and Current Warm Periods, however, could not be made because of anthropogenic and environmental factors influencing the record.