How does rising atmospheric CO2 affect marine organisms?

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Tropical Andes
Polissar, P.J., Abbott, M.B., Wolfe, A.P., Bezada, M., Rull, V. and Bradley, R.S. 2006. Solar modulation of Little Ice Age climate in the tropical Andes. Proceedings of the National Academy of Sciences: 10.1073/pnas.0603118103.

Among other things, the authors derived a 1500-year history of Andean biome elevation changes from analyses of pollen identified in cores removed from the Piedras Blancas peat bog (847'N, 7050'W). This work revealed that from at least AD 500 to about AD 1000, temperatures were generally higher than they were during the late 20th century.