I just read an interesting article at the NY Times tiled "What's Your Consumption Factor" My one liner summary is: worldwide consumption patterns have to even out so that resources can be managed appropriately to support everyone in the world.
The article has many statistics that illustrate the different levels of consumption across the world and relates it to population. It also explains that population growth is not a problem the way it is presented. A great read that I can't summarize appropriately so read it and see.
The fundamental point to understand is those populations that consume the most will need to reduce their consumption. It will be interesting to see how we adapt.