How does rising atmospheric CO2 affect marine organisms?

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Western Slope of the Northern Okinawa Trough, East China Sea
Fengming, C., Tiegang, L., Lihua, Z. and Jun, Y. 2008. A Holocene paleotemperature record based on radiolaria from the northern Okinawa Trough (East China Sea). Quaternary International 183: 115-122.

Using a well-established radiolarian-based transfer function, the authors developed a mean annual sea surface temperature (SST) history of the last 10,500 years based on data derived from the top 390 cm of a gravity core recovered from the western slope of the northern Okinawa Trough (2913.93'N, 12853'E) of the East China Sea. This effort indicated the existence of the MWP (~ AD 750-1250) and Little Ice Age (~ AD 300-600), after which it began to warm once again. However, the warming was short-lived, with the mean annual SST actually reversing its course and falling slightly below the coldest value of the entire Little Ice Age at about AD 1950, where the SST history terminates. Hence, we presume that current SSTs at this location are likely considerably lower than they were during the peak warmth of the MWP, having had insufficient time to once again reverse course and warm to such an elevated level from their lowest level of the past 1300 years.