How does rising atmospheric CO2 affect marine organisms?

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Western Pacific California Current
Field, D.B. and Baumgartner, T.R. 2000. A 900 year stable isotope record of interdecadal and centennial change from the California Current. Paleoceanography 15: 695-708.

The authors developed "a robust time series of stable isotope [δ18O, derived from Neogloboquadrina dutertrei] variability over the past millennium from the varved sediments of the Santa Barbara Basin [3410'N, 120W]," which they related to observed environmental variability within this part of the California Current over the past half-century, demonstrating that "thermal variability dominates the δ18O signal." This work revealed that "an anomalously warm coastal ocean persisted at the multicentennial-scale from roughly AD 1200 to 1450," which time interval, in the researchers' words, "coincides with the age generally assigned to the 'Medieval Warm Period'."