Yeah, but I don't think the idea of preventing things like volcanos or tsunamis, etc. ever really stood as a consideration for very long. The way I see it, why not look at all sides of situations like this? Is overpopulation not but another threat to our existence as a species? Why not welcome with open arms a few volcanos, tsunamis, tornadoes, and other natural disasters to do as they will? (...as if we had any choice to begin with) A gift from our dear earth to prolong the human with natural population control. And sure, like you said, let natural selection take its course.

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