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Jan 25, 2020 at 10:02 vote accept Gibdos
Jan 25, 2020 at 0:43 comment added jdunlop @Gibdos - As I say in the answer, there are a bunch of secondary effects to not having oil available that you'd have to think about - materials science would be very different, and your world's "90s" would not look like our world's "90s" in many respects beyond the lack of contrails. But it is the easiest way I can think of to take heavier-than-air travel out of the picture. (And if you like the solution, accept it!)
Jan 24, 2020 at 21:47 comment added Gibdos Excellent! While I was somewhat iffy about just limiting fossil fuels to accomplish this, the way you explain makes it seem like a simpler solution than whatever I would have come up with. Thanks!
Jan 24, 2020 at 20:38 history answered jdunlop CC BY-SA 4.0