It won't "end", but I could definitely see it being sent back to the dark ages. WW3 will be a nuclear war. I imagine that most of the globe would suffer astronomical casualties but there would be people in rural or otherwise secluded pockets of existence that survive.
Here's a mind fucker...
What if a civilization just like ours has already existed once or twice (Or more) on this planet? It could have been millions of years ago and they could have been every bit as advanced as us (maybe even more so.). They could have had the same problems with coexistence that we do and they could have obliterated their entire race with a nuclear war (or something of the sort. There's no telling whether they'd have invented nuclear weapons or not, but just for the sake of this story, they did.) So this civilization ends up destroying itself with it's own weapons... I'm talking eradicated, nothing left.
Evolution would go back to square one, and we'd climb out of the proverbial ooze as cavemen, never even knowing the prior civilaztion existed.
And before you say that we would have found remnants from them, try to remember this is before dinosaurs, cavemen, or time as we know it. And also, they were completely eradicated.
We'd never know. The same thing could happen to us. We destroy the world and everything in it and then evolution starts back at square one wth some other dude climbing out of the sludge.
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