A glitch in the history of sulphur isotopes could imply that methane emitted by the ancient biosphere created a high-altitude photochemical smog, which governed the climate in a distinctly Gaian way.
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Zahnle, K. Her dark materials. Nature 454, 41–42 (2008). https://doi.org/10.1038/454041a
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DOI: https://doi.org/10.1038/454041a
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