The Trojan Asteriods are in stable orbits created by Jupiter and the Sun. In effect, Jupiter has cleared its path as everything in its orbit is best thought of with respect to it. So Jupiter really isn't violating the spirit of the definition.
What if it were 3 or 4 billion years ago when the solar system was still young. There would still be a lot of clutter in the orbit of Jupiter and the other planets. We wouldn't be able to call them planets anymore by the IAU's definition.
I think of it more as a Viewmaster.
Oh, come on. It's at least Lite-Brite.
So, if technology breaks down completely, humans will still be able to survive. That's a little different than anywhere else in the solar system, right ?
We can still die at a moments notice.
Even if all of Mars was habitable, it would only add one quarter additional Earth surface. But it isn't. And the rest of the solar system is even less hospitable than Mars.
I never proposed it as a solution for overpopulation. I never proposed a mass migration. Why do people keep assuming that?
Top Ten Things Overheard At The ANSI C Draft Committee Meetings: (5) All right, who's the wiseguy who stuck this trigraph stuff in here?