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Earth nearly lost all its oxygen 2.3 billion years ago – Livescience.com

A new study pushes the permanent rise of oxygen in the atmosphere to 100 million years later than previously believed.

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Earth’s transition to permanently hosting an oxygenated atmosphere was a halting process that took 100 million years longer than previously believed, according to a new study.
When Earth first formed 4.5 billion years ago, the atmosphere contained almost no oxygen
. But 2.43 billion years ago, something happened: Oxygen levels started rising, then falling, accompanied by massive changes in climate, including several glaciations that may have covered the entire globe in ice. 
Chemical signatures…

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