In the future, we could extract as many resources as possible from PHAs before destroying them before they threaten us. Asteroids may be dangerous, but they do have quite a bit of resources that we could use!
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The good thing about identifying a potential future impact is that we should be able to do it years, maybe decades in advance so that it will only need the slightest nudge to prevent the impact. And yes there are also a lot of resources we could use and mine.