Stephen Hawking: Humans need to leave Earth or risk being annihilated by nuclear war or climate change

Stephen Hawking believed humans need to leave the Earth in order to avoid annihilation. In a collection of essays published posthumously on Tuesday, Hawking wrote that climate change and the possibility of nuclear war are putting humans in grave danger, adding that the latter is likely the biggest threat to humanity. The scientist, who died in March, wrote in Brief Answers to the Big Questions that people treat the Earth with "reckless indifference," which could result in our own extinction if we don't find another home.

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