How does rising atmospheric CO2 affect marine organisms?

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Dae-Am San Moor, Korean Peninsula
Yoshioka, T., Lee, J.-Y., Takahashi, H.A. and Kang, S.J. 2001. Paleoenvironment in Dae-Am San high moor in the Korean Peninsula. Radiocarbon 43: 555-559.

The authors analyzed the carbon isotopic composition of sediment cores taken from the Dae-Am San high moor (38.22N, 128.12E), located on the north-facing slope of Mount Dae-Am, Korean Peninsula. Results indicated upward increases in the δ13C of organic carbon in the sediment core, reaching a maximum at around AD 1100. These findings, according to the authors, suggest that the climate of the Korean Peninsula was "warm during the Medieval Warm Period," adding that if their interpretation is correct, the Medieval Warm Period was likely a global event.