Throwing garbage into space can never solve the world's big pollution problem in the long run. What goes up must come down. It might take years to see the negative results but they will be there. That is just not a sensible solution. It is more an "out of sight, out of mind" mentality. If trash is sent to space, then space will become polluted and...what then? That might be a problem that would not even have a solution.
People would become so sick, the entire earth might cease to function. Sending trash out into space is a dumb idea and those who are for it are just looking for an easy way out. Where pollution is concerned, there is no easy way out.