How does rising atmospheric CO2 affect marine organisms?

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Sossusvlei, Namib Desert, Namibia
Vogel, J.C. 2003. The age of dead trees at Sossusvlei and Tsondabvlei, Namib Desert, Namibia. Cimbebasia 18: 247-251.

The author radiocarbon dated stands of dead Acacia erioloba trees from locations within the central Namib Desert. Results indicated that trees growing near Sossusvlei (24.75S, 15.28E) started growing in the 11th-12th century "during the relatively humid conditions of the Medieval Warm Period and died out after the more arid conditions of the Little Ice Age set in during the 14th century."