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Epic world war — may kill most of us, but a few tribes here and there will survive and humanity will gradually rebuild.
Global warming — may cause a lot of destruction to the earth, probably will kill most animals that can’t adapt, but humans and plants are very adaptable and will survive.
Comet or meteor — […]

Science Daily has an interesting article that discusses possible tipping points in the earth’s climate systems. It asserts that an increase in temperature by a few degrees Celcius in specific places in the world could cause major irreversable ecological changes that could potentially have a huge impact on the climate and ecosystem of the rest […]