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