Artificial intelligence is progressing at a frightening pace leading humanity towards its ultimate destruction.
This is according to British theoretical astrophysicist, Sir Martin Rees, who believes we are facing an 'inorganic post-human era'.
By some estimates, he says, the process will begin in the next 25 years as robots begin to achieve intelligence rivalling that of humans.
Sir Martin, who is one of the world's most eminent astronomers, says that while Earth has existed for 45 million centuries, this century is special.
Over nearly all of Earth's history, threats have come from nature, but from now on, the worst dangers come from us – and specifically artificial intelligence.
He says that by any definition of 'thinking', the amount and intensity that's done by organic human-type brains will, in the far future, be swamped by the intelligence of AI.
'There are chemical and metabolic limits to the size and processing power of organic brains,' wrote Sir Rees, in an opinion piece for the Telegraph.
'Maybe humans are close to these limits already. But there are no such constraints on silicon-based computers.'