If we can terraform another world into being earthlike, then we wouldnt have to worry about overcrowding this planet nearly as much. not to mention all teh raw materials up in orbit. i bet a few metric gigatonnes of gold would change your mind :p
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I don't want to sound mean or anything but....what you just said is the perfect example of why I hate people.
Humans are greedy, robbing, blood-thristy, war-mongering, moronic, incompitent apes.
We cannot just 'forget' aout a problem just because we could possibly live on another planet.
Overcrowding will continue to happen until something prevents reproduction and/or something that whipes out many human numbers.
Invading another planet just so we can 'forget' our own planets problems is incompitent, us humans have caused so much trouble....and now we want to simply turn around and try to forget that?