How does rising atmospheric CO2 affect marine organisms?

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Las Tablas de Daimiel National Park, South Central Iberian Peninsula, Spain
Garcia, M.J.G., Zapata, M.B.R., Santisteban, J.I., Mediavilla, R., Lopez-Pamo, E. and Dabrio, C.J. 2007. Late Holocene environments in Las Tablas de Daimiel (south central Iberian peninsula, Spain). Vegetation History and Archaeobotany 16: 241-250.

Working with a number of sediment cores retrieved from a river-fed wetland that is flooded for approximately seven months of each year in Las Tablas de Daimiel National Park (39.4N, 3.8W, south central Iberian Peninsula, Spain), Garcia et al. employed "a high resolution pollen record in combination with geochemical data from sediments composed mainly of layers of charophytes alternating with layers of vegetal remains plus some detrital beds" to reconstruct "the environmental evolution of the last 3000 years." Among other things, this endeavor revealed the existence of "the warmer and wetter Medieval Warm Period (A.D. 900-1400)."