How does rising atmospheric CO2 affect marine organisms?

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Selwyn Lake, Subarctic Canada
Tillman, P.K., Holzkamper, S., Kuhry, P., Sannel, A.B.K., Loader, N.J. and Robertson, I. 2010. Long-term climate variability in continental subarctic Canada: A 6200-year record derived from stable isotopes in peat. Palaeogeography, Palaeoclimatology, Palaeoecology 298: 235-246.

Working with stable carbon isotope data obtained from α-cellulose isolated from the stems of Sphagnum fuscum moss contained within peat profiles obtained near Selwyn Lake (~59°53'N, 104°12'W) in the Canadian subarctic, with temperatures inferred from a linear model equation derived from δ13C values of the uppermost 10 cm of moss and corresponding July temperatures measured nearby over the period 1987-2004, Tillman et al. determined that "between c. 1300 and 900 cal yr BP, corresponding to a period of Mediaeval warmth, temperatures of a level similar to that experienced in the late 20th century appear to have prevailed."