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 〉 28. Aquaponics According to the prediction of the United Nations, 70% of the world population will reside in urban areas by 2050. If a household can spare one ping (3.3 square meter) on its balcony, aquaponics could be set up. The waste produced by fish supplies the nutrients for plants grown hydroponically, which in turn purify the water used in the pond. This creates a circular production of food.  〉
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