How does rising atmospheric CO2 affect marine organisms?

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Southern Okinawa Trough, East China Sea
Li, D.-L., Jiang, H., Li, T.-G. and Zhao, M.-X. 2011. Late Holocene paleoenvironmental changes in the southern Okinawa Trough inferred from a diatom record. Chinese Science Bulletin 56: 1131-1138.

Working with a sediment core that was collected in the Southern Okinawa Trough (SOT) in the southeastern section of the East China Sea (24°48.04'N, 122°29.35'E) in 2005, Li et al. identified the types and measured the concentrations of two groups of diatom species that allowed them to determine that "during the time interval 950-1500 AD, which corresponds with the MWP," there was "a warm-dry environmental condition in the SOT."