Unless something really catastrophically happens overnight, humans are of course not suddenly going to disappear from the face of the Earth. But given how humanity seems to like playing with fire — or as it may be, with nuclear and biochemical weapons of mass destruction — the idea of an Earth as we have known it but without any surviving human life on it is not so far-fetched.
So let's suppose that it does happen — that we become extinct as a species in just a matter of hours. Then what would happen to this lush, blue planet? Well, here's what...
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