I think the pole reversal is unlikely to end our existence, even in the worst case scenario. I think the highest probability of our exctinction comes from collision with space objects. We can poison this planet for another 1000 years and we'll survive, just not well. We've already survived several global catastrophes, including an ice age, the great flood, and at least one 2 year long 'nuclear winter' brought on by a volcanic eruption in the 1800's.
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