Population is one of the issues, but not the only one. If we could get the people to consume less, population wouldn't matter as much.
And bUU, I am not that knowledgeable about alternative economic structures, but from what I've seen, the answer to the problem we have with unbridled capitalism does not have to be solved with socialism or communism--I think it's just a matter of evolving capitalism to work out the current kinks and serve the most people and save the environment while we're at it.

