Breecker, D.O., Z.D. Sharp and L.D. McFadden. 2010. Atmospheric CO2 concentrations during ancient greenhouse climates were similar to those predicted for A.D. 2100. Proceedings of the National Academy of Sciences USA 107(2):576-580. doi: 10.1073/pnas.0902323106.
Typical vegetation in the West Mesa Pinyon Juniper habitat. Photo taken June 3, 2009.
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Estimates of atmospheric CO2 concentrations over the last 400 million years obtained from A) past analyses of carbon isotope composition of soil carbonates and B) from a re-analysis based on new information about the prevailing soil conditions during carbonate formation
Modified from Breecker et al. 2010