How does rising atmospheric CO2 affect marine organisms?

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Southern Vancouver Island, Canada
Zhang, Q.-B. and Hebda, R.J. 2005. Abrupt climate change and variability in the past four millennia of the southern Vancouver Island, Canada. Geophysical Research Letters 32 L16708, doi:10.1029/2005GL022913.

The authors constructed an ~4,000-year spring precipitation history from hundreds of well-preserved subfossil logs discovered at the bottom of Heal Lake (4832'N, 12328'W) near the city of Victoria, Vancouver Island, Canada. In contrast with the rest of the record, in the words of Zhang and Hebda, precipitation was "relatively stable around its mean condition" during the 10th-14th centuries, "corresponding to the North Atlantic Medieval Warm Period."