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I'm trying to decide, which has changed the world most.... the printing press, or computers... In the end, I think I may just pick flushing toilets.

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And they were probably a mistake. (http://permaculture.wikia.com/wiki/Tree_bog)

Pretty silly - the sewage treatment company could use willows if they worked in bulk. Instead they use settling and digestors. Still open-air in our town. Sludge is used as landfill and sometimes fertilizer/soil amendment. What's the difference?

Oh, we have enough infrastructure in the rich world to make flushing toilets work.

1) the sewage treatment company uses lots of energy and fairly clean (often drinkable) water to transport the sewage to their large-scale plants.

2) chances are that users will feel more responsible for a local, small-scale system, and not 'kill' it by flushing down all kinds of chemicals.

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