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Analyses of ice-core carbon isotopes show that variations in atmospheric CO2 levels during the past millennium are controlled by changes in land reservoirs. But whether climate variations or

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AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Jed O. Kaplan is at the Institute of Earth Surface Dynamics, University of Lausanne, Geopolis, 1015 Lausanne, Switzerland, Jed O. Kaplan Authors

* Jed O. Kaplan View author publications You can also search for this author inPubMed Google Scholar CORRESPONDING AUTHOR Correspondence to Jed O. Kaplan. RIGHTS AND PERMISSIONS Reprints

and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Kaplan, J. Climate or humans?. _Nature Geosci_ 8, 335–336 (2015). https://doi.org/10.1038/ngeo2432 Download citation * Published: 27

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