Reconstructions of atmospheric carbon dioxide concentrations over the past 65 million years are heading towards consensus. It is time for systematic testing of the proxies, against measurements and against each other.
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Beerling, D., Royer, D. Convergent Cenozoic CO2 history. Nature Geosci 4, 418–420 (2011). https://doi.org/10.1038/ngeo1186
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DOI: https://doi.org/10.1038/ngeo1186
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