It's not about what if we make this planet uninhabitable. There are lots of possible extinction level events which are not our doing. Humanity need more planets because of them.

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I think we have already survived extinction level events. I'm on team human and team earth. I don't want to waste resources to achieve a theoretical reality when we have proven resources right here.

For example, which one?

Do we have somethink which can protect earth from interstet asteroid like ʻOumuamua?