How does rising atmospheric CO2 affect marine organisms?

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Northern Icelandic Shelf, North Atlantic Ocean
Justwan, A., Koc, N. and Jennings, A.E. 2008. Evolution of the Irminger and East Icelandic Current systems through the Holocene, revealed by diatom-based sea surface temperature reconstructions. Quaternary Science Reviews 27: 1571-1582.

Based on analyses of diatoms found in a sediment core extracted from the northern Icelandic shelf (6637'53"N, 2051'16"W), the authors reconstructed August sea surface temperatures with a resolution of 40 years over the past 11,000-plus years. The figure below shows the most recent two millennia of this record. We have visually judged the period AD 800-1150 to represent the Medieval Warm Period, the peak warmth of which is essentially identical to the peak warmth of the Current Warm Period, albeit the peak warmth of the CWP does not appear at its current end-point, which would technically make the CWP's current temperature (which climate alarmists claim to be unprecedented over the past millennia or two) about 0.5C less than the peak MWP temperature.