How 'great' was the great oxygenation event?

ScienceDaily
Mar 1, 2021, 9:11 am172 pts
Around 2.5 billion years ago, our planet experienced what was possibly the greatest change in its history: According to the geological record, molecular oxygen suddenly went from nonexistent to becoming freely available everywhere. Evidence for the 'great oxygenation event' (GOE) is clearly visible, for…

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