How does rising atmospheric CO2 affect marine organisms?

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Cattle Pond, Dongdao Island, Xisha Islands, China
Yan, H., Sun, L., Oppo, D.W., Wang, Y., Liu, Z., Xie, Z., Liu, X. and Cheng, W. 2011. South China Sea hydrological changes and Pacific Walker Circulation variations over the last millennium. Nature Communications 2: 10.1038/ncomms1297.

Working with three sediment cores retrieved from Cattle Pond, Dongdao Island in the South China Sea (16°39'-16°41'N, 112°43'-112°45'E), Yan et al. report that their "downcore grain size reconstructions indicate that this site received less precipitation during relatively warm periods, AD 1000-1400 and AD 1850-2000, compared with the cool period (AD 1400-1850), the first of which warm periods thus represents the MWP at the site they studied.