How does rising atmospheric CO2 affect marine organisms?

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Song Hong (Red River) Delta, Vietnam
Li, Z., Saito, Y., Matsumoto, E., Wang, Y., Tanabe, S. and Vu, Q.L. 2006. Climate change and human impact on the Song Hong (Red River) Delta, Vietnam, during the Holocene. Quaternary International 144: 4-28.

The authors conducted palynological analyses of two sediment cores taken from the Song Hong (Red River) Delta, Vietnam (~20.26N, 106.52E) in an effort to reconstruct climate variations there throughout the Holocene. As indicated by an abundance of taxa well adapted to tropical and subtropical environments, they concluded that the Medieval Warm Period (~AD 500-1330) was warmer than the present climate.