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Global warming...this could cause a lot of natural distaters such as massive hurricanes. I don't think this is very close.

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A lot of peoples first response is global warming, but honestly, how will it take for global warming to kill everyone on our planet? The chance a huuuge meteor or a gigantic nuclear bomb killing everyone off is probably a greater likelyhood.

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Not directly, but it will probably cause a lot more wars because of mass migration screwing up society and drastically increasing water demands. Also drastically increasing poverty, leading to political crises.