Green thinking: There's nothing better than Planet Earth

We're all going to die. Horribly. If a stray asteroid doesn't get us, rampaging nanobots will quickly turn the planet into grey goo. That's without even mentioning supervolcanoes, global warming or the coming nuclear winter. As the celebrated astrophysicist Stephen Hawking said at a lecture on 15 June, the survival of humanity now depends on its ability to find new homes far away from this blighted disaster area of a planet.

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