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I imagine that in some distant future we are going to have to have near perfect recycling. Human waste, and even our bodies will have to go back into these clos

I imagine that in some distant future we are going to have to have near perfect recycling. Human waste, and even our bodies will have to go back into these closed ecosystems. I wonder if the energy from the sun is enough external input to sustain human life.

chronolitus 7y ago
It's certainly possible, since earth doesn't need much external input other from sunlight to sustain life. The question is, how scaled-down a self-sustaining ecosystem can we create and manage, which is capable of sustaining human life?