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News and Views
Nature 448, 1005-1006 (30 August 2007) | doi:10.1038/4481005a; Published online 29 August 2007
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Palaeoclimate: Oxygen's rise reduced
Timothy W. Lyons1
Abstract
Why did oxygen not appear in Earth's atmosphere until hundreds of millions of years after photosynthesizing organisms first produced it? Perhaps because reducing gases from undersea volcanoes claimed it first.
The oxygen in Earth's atmosphere is almost exclusively a product of photosynthesis. The transition from an early, virtually oxygen-free world to an irreversibly oxygenated one is linked to the first appearance and proliferation of photosynthesizing cyanobacteria.
- Timothy W. Lyons is in the Department of Earth Sciences, University of California, Riverside, California 92521, USA.
Email: timothy.lyons@ucr.edu
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