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Nature 400, 503-505 (5 August 1999) | doi:10.1038/22872

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Palaeoecology A breath of fresh air

D. E. Canfield1

The Earth has not always been bathed in an oxygen-rich atmosphere. Models of the early atmosphere suggest that it was oxygen-free, and contained chemically reduced compounds such as carbon monoxide, hydrogen gas and possibly methane1.

  1. D. E. Canfield is at the Institute of Biology, Odense University, Campusvej 55, 5230 Odense M, Denmark.
    e-mail: Email: dec@biology.ou.dk