"The earth doesn't have to be a dumping ground." Um..... what other alternative is there? It's a closed system. Granted, we shouldn't throw trash on the side of the road or poop in someone's yard. However, the earth is where we dispose of things. It's where bears poop in the woods. As humans, we have a choice of how to process what we no longer have a use for. Seems like Humanure is a logical solution for one part of the system.