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These are orthogonal issues. You are right that avoiding these kinds of catastrophic events will require technology (many solutions other than colonization have been proposed https://en.wikipedia.org/wiki/Asteroid_impact_avoidance). My point is that there are issues that are more imminent, and thus deserve far more attention.

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Such an object heading for earth could be detected tomorrow, and there may not be enough time for an effective response. We have to prepare in advance.

"My point is that there are issues that are more imminent, and thus deserve far more attention."

Far more attention? You said yourself that 10% of your country is already vegan and growing, that's a good piece of attention to me. How many of your friends are actively trying to get you into a starship? Come on, that's just a blog entry, no need to take it personnal :)

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