What are the biggest threats to the future of human existence on the planet? Not nuclear war or climate change as some might think, but man-made pathogens and thinking machines, the Australian philosopher Toby Ord tells Gideon Rachman. He talks about how he reached this conclusion and what can be done to avert disaster. Clips: Reuters

Toby Ord’s book, The Precipice: Existential Risk and the Future of Humanity, is published by Bloomsbury

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