How does rising atmospheric CO2 affect marine organisms?

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Igaliku Fjord, South Greenland
Lassen, S.J., Kuijpers, A., Kunzendorf, H., Hoffmann-Wieck, G., Mikkelsen, N. and Konradi, P. 2004. Late-Holocene Atlantic bottom-water variability in Igaliku Fjord, South Greenland, reconstructed from foraminifera faunas. The Holocene 14: 165-171.

The authors conducted a foraminifera, magnetic susceptibility and oxygen isotope multiproxy analysis of an ocean sediment core retrieved from Igaliku Fjord (60.70N, 46.03W), south Greenland, to obtain a paleohydrographic record of this region during the late Holocene. According to Lassen et al.'s interpretation of the data, the Medieval Warm Period was a time of "relatively warm climate in terms of surface water temperature" between AD 885 and 1240, which was punctuated by enhanced mixing and wind stress that likely indicates sea ice was lacking during this time. Based upon data presented in their Figure 3 on % distribution of selected foraminiferal species, δ18O and magnetic susceptibility, plus the relationship inferred from these data with temperature, we can conclude that current warmth has not yet reached the level of Medieval warmth.