That's why I say that more developing countries are growing so densely populated, that they need to modernize a bit, and adjust to having indoor flush toilets. You can't exactly go outside into an empty field to defecate anymore, when it has long since been filled in with human housing as far as the eye can see. Human wastes are among the most readily biodegradable of wastes imaginable. Even useful as fertilizer, at least in some developing countries. They say the grass grows greenest, around the septic tank. So not even nature minds, when they are handled properly. The trick is not to limit the growing volume of sewage or human wastes, but to make sure it is increasingly somewhat treated, and kept separate from drinking water, even though by sometimes artificial water treatment means. As some program on PBS, I recall said, it's not smart to poop in your drinking water. I also forgot to say earlier, that human hives aren't really such a "radical" idea. If ever humans manage to colonize other worlds, because other worlds aren't readily habitable to humans, it would be a lot more efficient for humans to live in "hive-like" structures, with maximal volume inside, and minimal exterior surface area, to get the cost per capita down to a reasonable level. Just as with airplane flights, it's so much cheaper per capita, to run them "full." That means you would actually want, just about as many people packed into these "life support" buildings, as can reasonably be made to fit. So if anybody has an aversion to living in "human hives" or "population arcologies," it would probably be best for them to stay and breed here, upon the earth. So just how crowded should spaceships be, anyway? One thing that I have given some thought to, is the living crew quarters on Star Trek; The Next Generation, upon their Enterprise spaceship. Why are they so spacious, and spartanly, simply furnished? There's not near enough "stuff" cluttering them all up, as would be seen of any "typical person's" house, on most any TV sitcom. Why do people of the future, not hoard and pile up stuff all over, like we do? I think their "replicators" are the answer to that. Why do you need bookcases and bookcases of books and DVDs, when it's all in the computers? Why do you need closets and closets of clothes, when you can just "replicate" clothes upon demand? How many cupboards does a person need, to store all their dishes, when their food comes out of a replicator, plate, utensils and all? Our homes often are overflowing with stuff, because we fear scarcity? So we hoard? Cheaper to just keep everything like a "packrat," than to have to go buy it again? And yet, I consider, The Enterprise, just doesn't have quite enough full decks, to house their supposed 1000+ "small city" population upon that spaceship. I lived in a college freshman highrise dorm, for a year and a half, and it only held but 500 people, and that's at double-person room occupancy, and the bathroom down the hall, not directly off our dorm rooms. Presumably, The Enterprise doesn't have the luxury of Dr. Who's time travel spaceship, which is conveniently bigger on the inside, than on the outside. Must be some "extra dimensions" thing going on there? So how do they fit over 1000 people onto that "galaxy class" spaceship? Aha! A partial answer to my question, in some particular episode. Sure, the crew quarters are bigger than what an admiral would have had, not so long ago, in the view of Scotty I think it was, who they found stuck in a trasporter cycling pattern, I think was their excuse for bringing back an old actor. But that's for higher ranking bridge crew sort of folk, and for visitors, not for lower ranking personel. That particular episode, let it slip, that unless one has a certain rank, they usually have a roommate assigned to them, and they can request a different roommate assignment. Okay, the spaceship is just a bit more "crowded" than it normally seems. But at least people aren't bunking above and below one another, among the missile tubes, as in today's submarines. In the future, we are told, biological wastes are the least of their worries. On the last franchise of the Star Trek sega, Enterprise, I recall some student in some spaceship/classroom hookup, asked, when you flush the toilet, where does it go? Into a "biomatter resquencer," I think the captain claimed, where it is refashioned into a boot, or whatever is needed. I think the living space, and the overall weight and speed of the spaceship, is among the more pressing concerns. Nobody's around counting toilet flushes, well unless that's a dusty old computer log file that nobody ever looks at?