How does rising atmospheric CO2 affect marine organisms?

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Taibai Lake, China
Xiao, X., Yang, X., Shen, J., Wang, S., Xue, B. and Tong, X. 2012. Vegetation history and dynamics in the middle reach of the Yangtze River during the last 1500 years revealed by sedimentary records from Taibai Lake, China. The Holocene 23: 57-67.

Working with a 150-cm-long sediment core extracted from the central portion of northern Taibai Lake (29°59'43"N, 115°48'27"E) in the middle reach of the Yangtze River, Xiao et al. analyzed pollen, charcoal and magnetic susceptibility data that led them to conclude that over the time interval AD 1050-1320 "vegetation changes at that period were mainly controlled by climatic changes, with limited influence from human activity," and that this period was "more warm and humid" than those that preceded and followed it. And they say that these observations mean that "the 'Medieval Warm Period' occurred in the middle reach of the Yangtze River," while further noting that "the reconstructed results of Ge et al. (2003, 2004) and the simulated results of Liu et al. (2005) also verified its existence in eastern China and even the whole of China."