Cars will not go away even with the depletion of oil. There will always be alternative ways of powering cars, using powercells/solar light, hybrid cars (which would slow the depletion of oil, sales are up 25% from last year). I read about the meteor that will pass by in 2019, and though it is large enough to be disatrous to Earth, it isn't going to hit, and it isn't so large that it will throw off the orbits of the planets. I also don't think that NASA has the equipment to predit the orbits to predict meteor impacts beyond 6 centuries (so roughly 2600), and there are none predicted before then. But would they really tell us? I think that would be a topic for paranoia.
In any case, if the humans are wiped off the Earth, it will be from human measures and nothing natural, I would venture to say nuclear war.
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Roses are red, violets are blue, I'm a schizophrenic and so am I.
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