How does rising atmospheric CO2 affect marine organisms?

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Lake Qinghai, China
Liu, Z., Henderson, A.C.G. and Huang, Y. 2006. Alkenone-based reconstruction of late-Holocene surface temperature and salinity changes in Lake Qinghai, China. Geophysical Research Letters 33: 10.1029/2006GL026151.

The authors developed a quantitative reconstruction of temperature changes over the past 3500 years based on alkenone distribution patterns in a sediment core retrieved from China's Lake Qinghai (37N, 100E), based on the alkenone unsaturation index that has been calibrated to the growth temperature of marine alkenone producers and "to temperature changes in lacustrine settings on a regional scale." This work revealed that the peak warmth of the Medieval Warm Period (AD 900-1500) exceeded the temperature of the latter part of the 20th century by about 0.5C.