Take a look at this chart
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http://en.wikipedia.org/wiki/File:Population_curve.svg>
It is a classic J curve, the sign that a population of an animal, any animal, has exploded beyond any reasonable bounds and quickly approaching the point where it is going to collapse, catastrophically.
That is where humanity is at, right now. Our population has exploded beyond any reasonable bounds, and is quickly approaching the point of catastrophic collapse.
This is the underlying reason why our society, both here and around the world, is starting to come apart. We simply don't have the resources to continue to support this kind of population. Our technology can't solve this problem, our social programs can't solve this problem, our economic models can't solve this problem, nor can resource reallocation solve this problem. At best these are short term band aid solutions that would put off the time of reckoning for a short time.
Yes, yes, I've heard it all before, "If you're so concerned about this, kill yourself", but that is not a serious answer for this serious problem.
In reality, the only solution is to institute a massive birth control program. That way, we can back down from this precipice we're on.
Otherwise, nature is going to take care of the problem for us, as it does for all species, with a spectacular crash and burn that will destroy humanity and possibly a good portion of the world.