Rather than wasting anything, these toilets give back: packets of urea (for fertilizer), table salt, volumes of freshwater, and enough power that you can charge your cell phone while taking a crap, should the need arise. Tie these toilets into the smart grid, and the electricity can be sold back to the utility company, marking the first time in history that anyone has been paid to poop. As a final component, do all this at a cost to the consumer of five cents a day. Now, that’s not just an upgrade, it’s a revolution.
