How can the human race survive the next hundred years?and got many answers.
It's funny how so often in the media you find instances of "what does Stephen Hawking say" always about something not related to his areas of expertise, say, something like, "Women who are able should definitely breastfeed."
Anyway, in this instance, it's Slashdot with a story saying that Hawking thinks mankind has to spread to other orbs to hedge its bets against nuclear war, pandemic, or something I've not heard of before called "sudden global warming." I'm sure Lubos is going to jump all over that one. Let's see if I can predict his behavior as well as Woit can.
And Nasa is doing so well financially, I'm sure 20 years is plenty to have a base on the moon. Oh wait, Hawking isn't American, maybe ESA can do the human exploration and leave NASA to do science?