You should read The Tragedy of the commons. Spelling errors not withstanding. That should dovetail well with your thoughts on consumption.
So, I think there is a huge population-consumption problem that is going to knock us silly (and probably get all nations angry at each other) if education is not used as the neutralizing weapon. Related, I found this commentary about consumption rather interesting:
Some thinkers say that individualistic consumerism distracts us from more satisfying collective pursuits. Others urge us to pare down our consumption. They want us to minimize our "carbon footprints," as if catastrophe draws closer with each trip to the store, with each exhale.
But the evidence is clear: People are most likely to be happy, healthy, well-educated and long-lived in places where people consume the most.
Maybe we don't need to be happy, or to live 80 years. But if we want to, then we've got a good thing going.