How does rising atmospheric CO2 affect marine organisms?

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East Coast of Korean Peninsula
Park, J. 2011. A modern pollen-temperature calibration data set from Korea and quantitative temperature reconstructions for the Holocene. The Holocene 21: 1125-1135.

Park used modern surface pollen samples from the mountains along the east coast of Korea to derive pollen-temperature transfer functions, the best of which was applied to five pre-existing fossil pollen records that were derived from four coastal lagoons of Korea's east coast plus one high-altitude peat bog. This work revealed the existence of the MWP over the period AD 700-1300. And according to the author's Figure 5c, it indicated that temperatures during the MWP reached about 0.1°C higher than temperatures of the past few decades.