"We used to think that the world was too big for us to seriously impact it. For much of our existence this was true. Our waste was biodegradable and there were only a billion or so of us. Now there are nearly 7 billion, producing non-biodegradable trash in unprecedented quantities. Whichever way you cut it, this cannot be sustainable. We live on a finite planet, where there is no "away". If we keep extracting all the good stuff out of the Earth, reconfiguring it into toxic substances, and dumping it out into our air, soil, and oceans, we can be sure that it will come back and bite us. "