Cheery physicist Professor Stephen Hawking says that mankind could be wiped out by our own creations within the next 100 years.
Answering audience questions at this year?s BBC Reith Lectures, he said that our rush to understand and improve life through science and technology could be humanity?s undoing.
He has previously suggested that colonising other planets will be the only way that the human race can survive, but he warns that we may lose Earth to some kind of major disaster before we have a chance to properly do so.
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