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A post-apocalyptic
Earth, emptied of
humans, seems like
the stuff of
science fiction TV
and movies. But in
this short,
surprising talk,
Lord Martin Re
(more)
A post-apocalyptic Earth, emptied of humans, seems like the stuff of science fiction TV and movies. But in this short, surprising talk, Lord Martin Rees asks us to think about our real existential risks — natural and human-made threats that could wipe out humanity. As a concerned member of the human race, he asks: What’s the worst thing that could possibly happen?