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"we are DESTROYING the earth, not mildly scratching it etc."

Only for very, very particular definitions of "Earth". There are numerous events in Earth's past that by any objective standard are more destructive than even the worst possible interpretations of man's efforts to date and worst plausible projections of man's efforts in the future. To pick one that probably doesn't even come to your mind, nothing we've done is even within two factors of magnitude of the disaster of the Great Oxygenation Crisis. Probably three, maybe even four. That one was bad. Well, bad at the time, anyhow; certainly none of us would today prefer that it had never happened.

That we're doing various dangerous and bad things is undeniable. That we're "DESTROYING" the Earth is a memetic weapon that has been crafted and fired at you by people who want you to give them lots of power to fix the DESTRUCTION of Earth, and to ensure that you stay in their control by ensure that anyone who disagrees with that assessment has the human instinctual "religious heretic" template applied to them, so you don't apply rational thought. Things are bad, but not so bad that you need that much despair.

That said, I don't expect us to lift industry into space. I expect us to lift an industrial seed into space that grows there, and that ultimately not all that many people will necessarily leave Earth.

I also expect that the current situation will not persist indefinitely. If we have clean energy, and look at how that is developing lately, lifting things into space isn't necessarily that big a deal. A "environmentally neutral" launch platform isn't even remotely inconceivable; it's not terribly out of reach today. The question isn't about the technology of 2019; the question is about the technology of 2069.




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