How does rising atmospheric CO2 affect marine organisms?

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Skagerrak, Northeast North Sea
Hass, H.C. 1996. Northern Europe climate variations during late Holocene: evidence from marine Skagerrak. Palaeogeography, Palaeoclimatology, Palaeoecology 123: 121-145.

Working with "four well-preserved continuous sediment sequences from the southern flank of the Skagerrak [approximately 57.8-58.2N, 8.6-9.6E]," which he describes as "a current-controlled sedimentary basin between the North and Baltic Seas," the author carried out "granulometric and stable oxygen isotope analyses." This work revealed the past presence of the Medieval Warm Period (AD 800-1350), which, in his words, "was characterized by warm summers, mild winters and little storm activity."