As Stephen Hawking enjoyed his zero-gravity flight on the new Boeing 727, he said that:

"[Life on Earth was] at the ever-increasing risk of being wiped out by a disaster, such as sudden global warming, nuclear war, a genetically engineered virus or other dangers. The human race has no future if it doesn't go into space. I therefore want to encourage public interest in space."

It's true, but I think the solution is not to escape to space, but to fix our home, our only home. The human race has no future if we do not take care of what we already have.