Isotopic data from an ice core have been used to estimate atmospheric oxidant levels during past climate transitions — pointing to relatively unexplored climate feedbacks as drivers of atmospheric composition. See Letter p.133
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Hegglin, M. The self-cleansing ability of prehistoric air. Nature 546, 41–42 (2017). https://doi.org/10.1038/546041a
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DOI: https://doi.org/10.1038/546041a
