How does rising atmospheric CO2 affect marine organisms?

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Lower Murray Lake, Canada
Besonen, M.R., Patridge, W., Bradley, R.S., Francus, P., Stoner, J.S. and Abbott, M.B. 2008. A record of climate over the last millennium based on varved lake sediments from the Canadian High Arctic. The Holocene 18: 169-180.

The authors derived thousand-year histories of varve thickness and sedimentation accumulation rate for Canada's Lower Murray Lake (8120'N, 6930'W), which parameters, in their words, "are related to temperatures during the short summer season that prevails in this region," according to the findings of several studies that had previously conducted similar field-work on other High Arctic lakes. These new data bases revealed that "the twelfth and thirteenth centuries were relatively warm," and their graphical representations indicate that Lower Murray Lake and its environs were often much warmer during this time period (AD 1080-1320) than they were at any time in the 20th century.