How does rising atmospheric CO2 affect marine organisms?

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Lake Tsuolbmajavri, Finnish Lapland
Weckstrom, J., Korhola, A., Erasto, P. and Holmstrom, L. 2006. Temperature patterns over the past eight centuries in Northern Fennoscandia inferred from sedimentary diatoms. Quaternary Research 66: 78-86.

The authors developed a high-resolution quantitative history of temperature variability over the past 800 years, based on analyses of diatoms found in a sediment core retrieved from a treeline lake - Lake Tsuolbmajavri (6841'N, 2205'E) - in Finnish Lapland. It revealed that what they call the "termination phase of the MWP" - which they indicate as having occurred between AD 1200 and 1300 - was 0.15C warmer than the peak warmth of the Current Warm Period, which in their history occurred at the conclusion of the 20th century.