If we as a species are going to survive, we are going to have to learn to live simpler lives. By that I mean consume less stuff. The world's poor are already living simpler lives, and not by their own choice, so it's up to us in the industrialized countries to set the example.
OK, I know this sounds preachy and far-fetched, not to mention being highly unlikely to influence anybody. Nevertheless, sooner by choice or later by necessity, we will have to recognize that we are, if we continue the present trend and lifestyle, going to consume our own planet. Our ancestors will look mighty funny one day clinging to the solar system's only orbiting trash dump while trying to choose between garbage and cannibalism as a source of food.
Consult any almanac and look at the exorbitant rate at which we are pumping oil, mining coal and other minerals, cutting forests, catching fish and dousing the land with ever-increasing amounts of fertilizers, pesticides and herbicides. There's no question we are just now beginning to run short of a lot of natural resources. The price of oil is just one example of what's in store for us unless we curb our appetites.