What’s the greatest threat to human existence in 2017?

If anyone knows about the end of the world, it’s Lawrence Krauss.

The astrophysicist is chair of the Bulletin of the Atomic Scientists which sets the Doomsday Clock – ie. how close we are to human-caused global catastrophe

So with radical extremism, global warming, rogue states, nuclear weapons, artificial intelligence and…Donald Trump all vying for the top spot – we asked Lawrence what we should be most worried about.

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