Soils give clean look at past carbon dioxide

It could take less of the greenhouse gas to reach a particular level of warming.

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Breecker, D. O. et al. PNAS doi: 10.1073/pnas.0902323106 (2009).
Breecker, D., Sharp, Z. D. & McFadden, L. Geol. Soc. Am. Bull. 121, 630-640 (2009).
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Richard A. Lovett
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Lovett, R. Soils give clean look at past carbon dioxide. Nature (2009). https://doi.org/10.1038/news.2009.1168