How does rising atmospheric CO2 affect marine organisms?

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Lake Chen Co, Southern Tibet, China
Zhu, L.-p., Zhang, P.-z., Xia, W.-l., Li, B.-y. and Chen, L. 2003. 1400-year cold/warm fluctuations reflected by environmental magnetism of a lake sediment core from the Chen Co, southern Tibet, China. Journal of Paleolimnology 29: 391-401.

Working with magnetic particles of different grain size found in a sediment core covering the period AD 593-1998 that was extracted from Lake Chen Co in southern Tibet (China, 2856'N, 9036'E), the authors measured a number of magnetic properties, including "low-frequency dependent susceptibility, susceptibility of anhysteretic remanent magnetism, the saturation isothermal remanent magnetism [and] the isothermal remanent magnetism reverse." This work revealed three warm periods: one near the beginning of the record, one in the middle (1120-1370, which they call the "Middle Ages Warm-period"), and one at the end (1900-1998). Of these three, Zhu et al. concluded that "the warmest one occurred in ca. 1120-1370."