How does rising atmospheric CO2 affect marine organisms?

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Svanemose Bog, East Coast of Jutland, Denmark
Barber, K.E., Chambers, F.M. and Maddy, D. 2004. Late Holocene climatic history of northern Germany and Denmark: peat macrofossil investigations at Dosenmoor, Schleswig-Holstein, and Svanemose, Jutland. Boreas 33: 132-144.

The authors analyzed the plant macrofossil remains from a sediment core obtained from a raised peat bog in northern Germany (Svanemose Bog, 55.37N, 9.50E) over the past 4000 years to extract records of changing bog surface wetness, which they interpreted as a proxy climate signal for precipitation and temperature. Results of the analysis revealed "an abrupt warming/drying trend" during the Medieval Warm Period and which peaked about A.D. 1200.