human race "will be extinct within 100 years", page-21

"space stations are too confined. We need to be able to roam free in the new habitat."

we can for free. but it will be slow.

http://en.wikipedia.org/wiki/Interplanetary_Transport_Network

We can also move around by orbiting an asteroid.

Agreed need to reduce population and people will live well into their 100s in the future with advancements in genome research. IMO.