Human race will not survive on the Earth, but will move to Space

Stephen Hawking : theoretical physicist, cosmologist, and author.
I don't think the human race will survive the next thousand years, unless we spread into space. There are too many accidents that can befall life on a single planet. But I'm an optimist. We will reach out to the stars.

"Colonies in space may be only hope, says Hawking" by Roger Highfield in Daily Telegraph (16 October 2001)