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Earth almost lost all oxygen 2.3 billion years ago.



Earth’s transition to permanently hosting an aerobic atmosphere is a disruption process that takes 100 million years longer than previously believed, according to a new study.

When the Earth was first formed 4.5 billion years ago, the atmosphere was almost nonexistent. OxygenBut 2.43 billion years ago, something happened: oxygen levels began to rise, then decline, along with massive climate change, including many glaciers that could cover the entire planet as ice.


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