How does rising atmospheric CO2 affect marine organisms?

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Owens Valley, White Mountains, California, USA
Ababneh, L. 2008. Bristlecone pine paleoclimatic model for archeological patters in the White Mountains of California. Quaternary International 188: 59-78.

The author derived a history of temperature-related tree-ring width indices from both whole-bark and strip-bark bristlecone pine trees from both Patriarch Grove and Sheep Mountain in California, USA, which commenced at AD 1171 and extended all the way to AD 2002. This history began in the midst of the Medieval Warm Period, which extended, in our estimation, to approximately AD 1430. During this interval there were several periods when tree-ring width indices were more than double those experienced over the final decades of the 20th century; and in a couple of instances they were even three times greater.