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A malevolent AI could pave the earth.

We might get a nanotech grey goo scenario, or just a sufficiently bad nanotech disaster to kill off higher life forms.

Plausibly, the parent post meant erase modern civilization rather than every last homo sapiens. Full scale nuclear war could do that. So could an an engineered superflu. Both are a lot more likely than an asteroid strike.

If we can last until we get off the planet, our long term prospects are a lot brighter.

What makes you so certain that humanity won't be wiped out by a full nuclear war or a massive asteroid impact?

I don't think you realize just how big the earth it.

tech will be erased certainly :)