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 human activity were mainly responsible is uncertain.
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Kaplan, J. Climate or humans?. Nature Geosci 8, 335–336 (2015). https://doi.org/10.1038/ngeo2432
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DOI: https://doi.org/10.1038/ngeo2432
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