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The future of humanity may be at a crucial turning point, say Astronomer Royal Martin Rees.

In a wide-ranging talk at New Ů��С��Ƶ Live in London on Sunday, Rees said that inaction may lead to a “catastrophic setback to civilisation”.

Speaking about energy policy, artificial intelligence and space exploration, Rees called for accelerated research into low-carbon energy sources and the need for urgent climate action.

“Extinction rates are rising. We’re destroying the book of life before we’ve read it,” said Rees. “The biomass in humans, cows and domestic animals is 20…