The question was about the ...

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The question was about the challenge of urban ecological sanitation and not only sanitation. This question is connected with greening the cities, roof garden,transition town, and so on. Urban ecological sanitation is a different way of thinking, using diversity of situation to create an adapted sanitation process as http://www.wsafrica.org/welcome/ is doing. toilets are the best way to isolate human from dejections after this operation I think it would be interesting to have some "creative" insight. Like doing directly aquaponie, earthworm compost, and so on. What is the ecological cycle for human waste?