How does rising atmospheric CO2 affect marine organisms?

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Lake Teletskoye, Altai Mountains of Southern Siberia
Kalugin, I., Selegei, V., Goldberg, E. and Seret, G. 2005. Rhythmic fine-grained sediment deposition in Lake Teletskoye, Altai, Siberia, in relation to regional climate change. Quaternary International 136: 5-13.

Sediment cores from Lake Teletskoye in the Altai Mountains of Southern Siberia (5142.90'N, 8739.50'E) were analyzed to produce a multi-proxy climate record spanning the past 800 years. The Medieval Warm Period was identifed as a climatic period evidenced between the start of the authors' record in 1210 AD and ending around 1480 AD that was "warmer and more humid than today."