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Move to space to save the earth is useless statement. Human isn’t able save natural resources on earth, how come he can build enough resources to survive human being in space or mars or whatever. I would say Focus on earth, invest on the broken things

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Earth's limited resources might well be the primary reason to explore other planets.

Think of it as a hedge against possible extinction.

Being a multi-planterary species means that an existential threat on earth (I.e. asteroid, super bug, etc.) doesn’t wipe out all of humanity.

Agreed. But it's a bit like your house has caught fire and, rather than try to put it out, you call a realtor and go shopping for a new home. Why not try to save your current home, first?

Because the only way to stay warm in this current house is literally lighting bits of it on fire.

lets just hope it is not a gamma ray burst as that would potentially still get both planets

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