How does rising atmospheric CO2 affect marine organisms?

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Loch Sunart, Northwest Scotland Coast
Cage, A.G. and Austin, W.E.N. 2010. Marine climate variability during the last millennium: The Loch Sunart record, Scotland, UK. Quaternary Science Reviews: 10.1016/j.quascirev.2010.01.014.

From a broad sediment shelf at a depth of 56 meters in the main basin of Loch Sunart -- a fjord on the northwest coast of Scotland (5640.20'N, 0552.22'W) -- the authors extracted several sediment cores from which they developed a continuous thousand-year δ18O record of the shells of the benthic foraminifer Ammonia beccarii that extended all the way up to AD 2006; and when operating upon these data with a well-established palaeotemperature equation, the two scientists created a concomitant history of bottom-water temperatures that revealed the occurrence of a distinctive warm period between about AD 940 and 1050, during which time the peak warmth attained was approximately 0.3C less than the peak warmth of the Current Warm Period.