The planetary

Would it be possible to accommodate all humans in space habitats orbiting Planet Earth? Would this be a good idea?
Possible? Yes. Toward the beginning of High Frontier studies, I think it was calculated that just the L-4 and L-5 points alone could accommodate enough habitats to house the entire population of Earth. And those would not be the only 2 possibilities for Earth orbit. That circular orbit about halfway to lunar orbit which they later recommended should provide even more space.
In this illustration, the dashed lines represent the orbits just mentioned.
http://ssi.org/assets/images/Ch08p126.gif
A good idea? I would more say hardly necessary. I think one of the strengths of the orbital habitat proposal is that they can be homes anywhere in the solar system we care to orbit.
Regards,
Mike Combs