Earth's ancient atmosphere may have been as much as 70% carbon dioxide, finds new study that analyzed micrometeorites that fell to Earth some 2.7 billion years ago. By comparison, our atmosphere today is 0.04% carbon dioxide.

Earth's ancient atmosphere may have been as much as 70% carbon dioxide, finds new study that analyzed micrometeorites that fell to Earth some 2.7 billion years ago. By comparison, our atmosphere today is 0.04% carbon dioxide.

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