How does rising atmospheric CO2 affect marine organisms?

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Central Scandinavian Mountains, Sweden
Linderholm, H.W. and Gunnarson, B.E. 2005. Summer temperature variability in central Scandinavia during the last 3600 years. Geografiska Annaler 87A: 231-241.

Summer temperatures were inferred from a tree-ring width chronology derived from living and subfossil Scots pines (Pinus sylvestris L.) sampled close to the present tree-line in the central Scandinavian Mountains (6310'N, 1225'-1335'E) spanning the time period from 2893 BC to AD 2002. Between AD 900 and 1000, summer temperature anomalies were as much as 1.5C warmer than the 1961-1990 base period.