How does rising atmospheric CO2 affect marine organisms?

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Fournier Swamp, New Caledonia
Wirrmann, D., Semah, A.-M., Debenay, J.-P. and Chacornac-Rault, M. 2011. Mid- to late Holocene environmental and climatic changes in New Caledonia, southwest tropical Pacific, inferred from the littoral plain Gouaro-Deva. Quaternary Research 76: 229-242.

Based on their multi-proxy approach to climate evaluation, the authors determined that between ca. 2640 and 2000 cal yr BP, conditions were "drier and cooler," while subsequent observations linked wetter with warmer. More specifically, they report that "between ca. 1250-500 cal yr BP the higher % of Rhizophoraceae and their peak around ca. 1080-750 cal yr BP underscore a mangrove belt development along the coastline." And they state that this episode must be related to a wetter period and "may be related to a more global phenomenon such as the MWP in the Northern Hemisphere." Thus, we consider the period AD 920-1250 to represent the MWP in this part of the southwest tropical Pacific.