This article details the concerns of a scientist regarding rogue asteroids that could cause a dinosaur-like extinction event on earth. He's rightfully concerned, we're woefully unprepared for such an event to the point that we may not even see it coming ahead of time. But it's a problem that we can solve, if we just put a little cash and effort into it. Seems like it would be money well spent to me.
https://www.theguardian.com/science/2016/dec/13/space-asteroid-comet-nasa-rocket
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