The latest models suggest that atmospheric oxygen could have fluctuated between high and low concentrations once photosynthesis had evolved. But does the geological evidence really support this?
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Kasting, J. Ups and downs of ancient oxygen. Nature 443, 643–645 (2006). https://doi.org/10.1038/443643a
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DOI: https://doi.org/10.1038/443643a
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