How does rising atmospheric CO2 affect marine organisms?

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Upper Gunnison Basin, Colorado, USA
Emslie, S.D., Stiger, M. and Wambach, E. 2005. Packrat middens and late Holocene environmental change in southwestern Colorado. The Southwestern Naturalist 50: 209-215.

Analyses of subfossil macrobotanical remains of 17 bushy-tailed packrat (Neotoma cinerea) middens in the Upper Gunnison Basin of Colorado revealed a period of warmer conditions between AD 500 and 1050.