How does rising atmospheric CO2 affect marine organisms?

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Northern Taiwan
Wang, L.-C., Wu, J.-T., Lee, T.-Q., Lee, P.-F. and Chen, S.-H. 2011. Climate changes inferred from integrated multi-site pollen data in northern Taiwan. Journal of Asian Earth Sciences 40: 1164-1170.

The authors analyzed pollen data obtained from ten lake sediment cores and two land cores to assess the species abundances and alterations of forest-covered areas in northern Taiwan (23°17'N-25°18'N, 120°54'E-122°02'E) in response to changes in humidity and temperature over the last 2000 years. This work revealed, in the words of Wang et al., that the climate of northern Taiwan was "wet and warm during 1000-500 cal. yr BP, which corresponded to the Medieval Warm Period (MWP)," and that "an increased density and dispersal of Tsuga pollen corresponding to 500-200 cal. yr BP was observed, which corresponded to the Little Ice Age (LIA)." And from the authors Figure 6, which presents a relationship between Tsuga pollen and temperature, it is shown that the MWP was slightly warmer than the CWP.