If I was trying to write hard scifi, I would use something I call the Whale Fall hypothesis for resolving the Fermi Paradox. The SEEDS of life are ready to sprout basically all over, but they require an unlikely gift of the universe to truly flourish, albeit temporarily.
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You can also get these jalopies using wood which I lovepic.twitter.com/Dwu5YoasuO
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And me being ignorant of the engineering here, does this require any intermediate steps or technology that cannot be achieved with steam power? Like, do you have to first have internal combustion then 'go back' to this tech? Clearcutting forests for biofuel could kinda work.
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In Anathem, which has seen civilization rise and fall a dozen times, there are passing references to "forests of fueltrees"
End of conversation
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