How does rising atmospheric CO2 affect marine organisms?

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Laguna San Pedro, Andean Region, Southern Chile
Fletcher, M.-S. and Moreno, P.I. 2012. Vegetation, climate and fire regime changes in the Andean region of southern Chile (38°S) covaried with centennial-scale climate anomalies in the tropical Pacific over the last 1500 years. Quaternary Science Reviews 46: 46-56.

The two University of Chile scientists, as they describe it, "sampled and analyzed sediment cores from Laguna San Pedro (38°26'S, 71°19'W)," which they describe as "a small closed-basin lake located in the Temperate-Mediterranean Transition zone in the Andes of Chile," where they focused on reconstructing the vegetation, climate and fire regime histories of the past 1500 years, based on analyses of pollen, charcoal, sedimentation rate, etc. In doing so, they found evidence for the latter 200 years of the Roman Warm Period, which was followed by the Dark Ages Cold Period, which was followed by the Medieval Warm Period, which was followed by the Little Ice Age, which was followed by the transition to the Current Warm Period. And their data indicate (and they explicitly state) that the MWP held sway between 1000 and 725 cal yr BP (AD 950-1225).