How does rising atmospheric CO2 affect marine organisms?

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Mt. Storsnasen, Southern Swedish Scandes, Sweden
Kullman, L. 2005. Pine (Pinus sylvestris) treeline dynamics during the past millennium - a population study in west-central Sweden. Annales Botanici Fennici 42: 95-106.

The author reconstructed a 1000-year history of the dynamics of a fire-free treeline population of Scots pine (Pinus sylvestris) on the lower east-facing slope of Mt. Storsnasen (63.23°N, 12.43°E) near the mouth of Handölan Valley in the southern Swedish Scandes. From the results of the analysis, Kullman infered that "a large proportion of the subfossil pines that died during the past millennium originated from a phase of relatively favorable climatic conditions during the Medieval period," adding that whether or not the current stand density and stature exceeded that of the Medieval optimum "cannot be judged by the data [in this study]."