I truly believe that we're going to destroy ourselves with nuclear weapons while simultaneously the polar ice caps melt, flood the world, kill the polar bears, and we all die either from nuclear or UV exposure.
I'm not sure that we'll be around long enough to see the comet. Though, I figure that a comet strike is an eventuality.
Either that, or, I have to disagree with V - I think that greenhouse gasses, pollution, our combined carbon footprint will really make the planet unlivable.
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