How does rising atmospheric CO2 affect marine organisms?

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Skalafjord, Faroe Islands
Reference
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

Description
A temperature reconstruction based upon the dinoflagellate cyst and acritarch distribution within a sediment core extracted from Skalafjord, Faroe Islands (62°10.54'N, 6°47.94'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."