High-temperature water–rock reactions produce large quantities of hydrogen, which must be transported to cooler settings to sustain life. Lower-temperature hydrogen generation could potentially support life in situ and free subsurface microbes from photosynthetic constraints.
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D'Hondt, S. Subsurface sustenance. Nature Geosci 6, 426–427 (2013). https://doi.org/10.1038/ngeo1843
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DOI: https://doi.org/10.1038/ngeo1843