A combination of two anoxygenic pathways of photosynthesis could have helped to warm early Earth, according to geochemical models. These metabolisms, and attendant biogeochemical feedbacks, could have worked to counter the faint young Sun.
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Laakso, T.A. Methane multiplication. Nature Geosci 11, 6–7 (2018). https://doi.org/10.1038/s41561-017-0043-y
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DOI: https://doi.org/10.1038/s41561-017-0043-y
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