The complicated history of how the Earth’s atmosphere became breathable

Ars Technica
By Howard LeeMay 15, 2023, 7:30 am152 pts
Enlarge (credit: Aurich Lawson | Getty Images) The Great Oxygenation Event, which occurred around 2.4 billion years ago, was one of the biggest transformations of our planet. Before it, there was practically no oxygen in the atmosphere; after, there was. Conventionally, the rise of oxygen is seen as life…

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