How does rising atmospheric CO2 affect marine organisms?

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Egedesminde Dyb, South-western Disko Bugt, West Greenland
Perner, K., Moros, M., Lloyd, J.M., Kuijpers, A., Telford, R.J. and Harff, J. 2011. Centennial scale benthic forminiferal record of late Holocene oceanographic variability in Disko Bugt, West Greenland. Quaternary Science Reviews 30: 2815-2816.

Based on the identification and quantification of various foraminiferal species found in a sediment core extracted from the bottom of a deep-water trough (Egedesminde Dyb) in the southwestern Disko Bugt of West Greenland at coordinates of ~68°38'N, 53°49'W, Perner et al. derived a 3600-year proxy-temperature history of the West Greenland Current at that location. This history revealed "a marked long-term cooling trend over the last 3.6 ka BP," but they found that superimposed on this longer-term cooling trend, there was evidence of millennial to centennial scale variability, where one of the warm intervals was said by them to constitute "the time period of the 'Medieval Climate Anomaly'," which they graphically identify as occurring over the period AD 1000-1500. And their proxy-temperature graph indicates that that entire period was significantly warmer than the Current Warm Period has been to date, due to the huge cooling that was experienced during the Little Ice Age.