Comment Re:Profitable, if self-contradictory (Score 1) 549
Why not make a biosphere on Earth ?
Although it would make more sense to first build one in antartica, the sahara, or the bottom of the ocean
and it would probably be a small fraction of the cost, it would still probably be easier to get funding for
one on mars. The only way I see of getting funding for one on earth would be using mars as an excuse.
Even if we did decide to build a biodome for 100k people in antartica (which is the closest to mars conditions),
there is currently no reason to go thru the extra expense of making it 100% airtight. Even a biodome under
the ocean would be cheaper to build with ventilation than with fullblown air factories.