Researchers persist in tackling our ignorance of what life was like way back in Earth's history. Evidence of methane production in ancient microbial ecosystems now emerges from 3.5-billion-year-old rocks.
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Canfield, D. Gas with an ancient history. Nature 440, 426–427 (2006). https://doi.org/10.1038/440426a
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DOI: https://doi.org/10.1038/440426a
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