Yes but we need to treat the earth as the only habitable place we will ever have and run sustainably. We need to be using less than one earth year of renewable resources each year and use a minimum number of non renewable. I don't think we should be sending people into space all that much. We should as much as possible seek to learn how to mine, process, and produce in space. Its certainly something we cannot do now but if we are ever to make any real progess it will have to be something we figure out. Its also likely the best direction for the resources we put to space as far as return. By that I mean the same way much of our technology was spurred by the space race due to the challenge of getting out into it and to the moon. I feel learning to mine and automate in space will have the greatest returns in technological advancement for us. I think ideally any time we send people to space whe have a destination built already for them to go to. So send rovers and such to the moon and try to excavate and build a dome or such and install equipment. I mean if we could figure out a way to automate making rocket fuel in space and could make fuel depots that would be huge. I also want to experiment with things on the moon. Like I think we should make a moon space elevator. Not because its a very necessary thing for the moon but to figure out the tech. maybe later we try to make one on mars. if we made them on a variety of space objects we might get sure enough to do one on earth.