How does rising atmospheric CO2 affect marine organisms?

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Hani Village, Liuhe County, Jilin Province, China
Hong, B., Liu, C.-Q., Lin, Q.-H., Yasuyuki, S., Leng, X.-T., Wang, Y., Zhu, Y.-X. and Hong, Y.-T. 2009. Temperature evolution from the δ18O record of Hani peat, Northeast China, in the last 14000 years. Science in China Series D: Earth Sciences 52: 952-964.

Working with cores extracted from a peat land near Hani Village, Liuhe County, Jilin Province, China (42°13'N, 126°31'E), the authors developed "a peat cellulose δ18O temperature proxy record proximately existing for 14,000 years," which they say "provides evidence that the Medieval Warm Period existed in the Chinese mainland," peaking "at about 1.1 cal. kyr BP in the Hani record." The graphical representation of their data also reveals that the MWP held sway from approximately AD 900 to 1100, and that it was warmer than the CWP.