You likely grew up with flushing toilets, seeing your poop as something to dispose of, but you might also be one of those who agree that humans can only thrive once we live in harmony with nature. The zero-waste movement is in a sense, a yearning to imitate nature where there is no such thing as waste; one organism's excrement is another's food. Compost toilets turn human "waste" (discarded feces and urine) into soil fertility as humanure (food for micro-organisms and fruit trees) - the actual human waste is everything that cannot decompose: cigarette butts, plastic-sixpack rings, deodorant cans, batteries, the five billion gallons of polluted drinking water we flush down our toilets everyday, and the millions of tons of organic material dumped into the natural environment year after year.