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In one of my classes, I had the chance to visit the university's aquaponic system. It was very efficient, with the waste from fish essentially feeding the plants. If something like that was implemented on a large scale, there wouldn't be any food shortages. The system impressed me to the point that I want to build my own. An interesting sidenote is that an analysis of the products showed that they had higher levels of some nutrients than conventionally grown produce.
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