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.

https://www.pghcitypaper.com/pittsburgh/study-says-renewable-energy-power-plants-will-overtake-natural-gas-plants-by-2035/Content?oid=15834618

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