How does rising atmospheric CO2 affect marine organisms?

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Skalafjord, Faroe Islands
Roncaglia, L.  2004.  Palynofacies analysis and organic-walled dinoflagellate cysts as indicators of palaeo-hydrographic changes: an example from Holocene sediments in Skalafjord, Faroe Islands.  Marine Micropaleontology 50: 21-42

A temperature reconstruction based upon the dinoflagellate cyst and acritarch distribution within a sediment core extracted from Skalafjord, Faroe Islands (6210.54'N, 647.94'W) was developed for the period 6350 BC to AD 1430.  The author says that an "amelioration of climate conditions" with warmer sea surface temperatures prevailed between AD 830-1090, which "may encompass the Medieval Warm Period in the Faroe region."