How does rising atmospheric CO2 affect marine organisms?

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Dosenmoor Bog, Northern Germany
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 (Dosenmoor Bog, 54.17N, 10.08E) 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 the climate of this region was dry and warm during the Medieval Warm Period (~ AD 600-1300), when there was an "almost complete domination of drier-indicating Sphagnum section Acutifolia" and "virtually no leaves at all of [wetter-indicating] S. papollosum and S. s. Cuspidata."