How does rising atmospheric CO2 affect marine organisms?

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Western Liaohe River Basin, Inner Mongolia, Northeastern China
Li, Y.Y., Willis, K.J., Zhou, L.P. and Cui, H.T. 2006. The impact of ancient civilization on the northeastern Chinese landscape: palaeoecological evidence from the Western Liaohe River Basin, Inner Mongolia. Holocene 16: 1109-1121.

The authors conducted a number of proxy analyses, including palynology, microfossil charcoal, stable isotopes (δ13C and δ15N) and sediment geochemistry, on a 3.6-m sediment core taken from a relict oxbow lake in the Western Liaohe River Basin (42.07N, 119.92E) of northeastern China in an effort to reconstruct the environmental history of that region over the past 5400 years. The results indicated the existence of a period of enhanced warmth and wetness from about AD 800 to 1400, which they associated with the Medieval Warm Period. Since they did not discuss the degree of warmth, however, we classify this paper as a Level 3 study, which merely confirms the existence and timeframe of the MWP.