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Environment
David Mole, Postdoctoral fellow, Earth Sciences, Laurentian University

FORGOTTEN HISTORY: Where did the earth s oxygen come from new study hints at an unexpected source - The Untold Story

Earth Ocean US National Science Foundation

The amount of oxygen in the Earth’s atmosphere makes it a habitable planet.

Twenty-one per cent of the atmosphere consists of this life-giving element. But in the deep past — as far back as the Neoarchean era 2.8 to 2.5 billion years ago — this oxygen was almost absent.

So, how did Earth’s atmosphere become oxygenated?

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