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Worldbuilding

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    $\begingroup$ There is no problem to solve. It is believed that for much of the first billion years of the Earth’s existence it was an ocean world with high levels of greenhouse gases, so such a planet is obviously possible since we’re living on it at a later stage in its history. $\endgroup$
    – Mike Scott
    Commented Dec 15, 2023 at 7:11
  • $\begingroup$ to reinforce Mike life did not make the co2 of earths atmosphere life took in co2 and made the atmospheres oxygen. It is life that made the atmosphere breathable. $\endgroup$
    – John
    Commented Dec 16, 2023 at 23:20