If you had a house that was infested with pests (roaches and the like) would you get rid of the problem by feeding them?
Nope. I think a potential "cure" to over population is to stop feeding the problem. I see these commercials on tv with sally struthers asking for money so they can send food to a population of people who cannot feed themselves. Obviously, if the people of a geographical area cannot feed their own, there are too many of them. So out of compassion, we make the problem worse, bu 'feeding the roaches.'
All that this accomplishes is making sure that the next generation is even less able to feed themselves. Stop sending aide, or put something in it to dramatically decrease fertility. Some will starve so that those who come next might have a chance to prosper.
As to getting into space there is really only one way with current technology to do it at practical costs. Rockets are too expensive. I think it costs several thousand dollars per pound to get something into orbit.
The idea of a space elevator is awesome. Anchor a cable 25-thousand miles long, to the earth at the equator and the other end will be floating in space.
It would be expensive to build, but I think it could be done. The best part is solar power would finally amount to something. Imagine massive solar farms in space, with the ability to transfer the power to earth surface via cable! A solar cell would be immensely more efficient in space than they are on earth, with clouds and night to deal with. There are no such concerns I'm space.
The cost of moving weight up a space elevator is pennies on the dollar compared to rockets. It would make it possible to build large areas for housing. There we could also construct space craft in orbit, allowing for exploration and exploitation of the resources in the inner solar system, the asteroid belt.
The space elevator needs to be a top priority, IMO.