How does rising atmospheric CO2 affect marine organisms?

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Egelsee Bog, Central Switzerland
Larocque-Tobler, I., Heiri, O. and Wehrli, M. 2010. Late Glacial and Holocene temperature changes at Egelsee, Switzerland, reconstructed using subfossil chironomids. Journal of Paleolimnology 43: 649-666.

Working with two sediment cores extracted in September of 1998 from a raised bog in central Switzerland (4711'N, 835'E), Larocque-Tobler et al. developed a16,000-year record of mean July temperature from their meticulous identification and quantification of chironomid species assemblages. This temperature history revealed the presence of a period of warmth between about AD 700 and 1400, based on an empirical relationship previously derived between species abundances and mean July temperature conditions in 103 Swiss lakes over the period of the historical temperature record. This effort revealed the existence of an interval of significant warmth between about AD 700 and 1400, the peak temperature of which was approximately 0.75C cooler than what they call the "present-day temperature."