How does rising atmospheric CO2 affect marine organisms?

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Lake Edward, Uganda Congo
Reference
Russell, J.M. and Johnson, T.C. 2005. A high-resolution geochemical record from Lake Edward, Uganda Congo and the timing and causes of tropical African drought during the late Holocene. Quaternary Science Reviews 24: 1375-1389.

Description
The authors analyzed % biogenic silica (%BSi) from piston cores retrieved from Lake Edward (0N, 30E), Uganda Congo, equatorial East Africa. Correlation of %BSi with other climatologically-forced geochemical and lake level records from other equatorial African lakes further allowed them to develop a regional precipitation and drought history over the past 5400 years. Results indicated that drought affected "virtually all of tropical East Africa" between ~AD 1000 and 1200, which falls well within the era of the Medieval Warm Period.