Well, eventually, but please ignore the tabloid headlines about a "planet killer" earth crossing asteroid. Does it exist? Yes.
Is it going to hit Earth? Maybe...centuries from now.
Let's worry about climate change...by that point either we'll be extinct or we'll have planetary defenses.
And none of US are going to be alive to worry about it.
(Yes, a 1km wide asteroid hitting the Earth would be very, very bad, although it's still a lot smaller than the one that killed the dinosaurs, which was about 12km wide...)
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