“The human species will have to populate a new planet within 100 years if it is to survive,” professor Stephen Hawking will say this summer in “Expedition New Earth” — a documentary that debuts this summer as part of the BBC’s forthcoming “Tomorrow’s World” TV series.
He cites “climate change, overdue asteroid strikes, epidemics and population growth” as reasons to leave.
That “100″ figure is dramatically lower… read more