1. Used water can be recycled by using a sewage system to collect all the used water to be purified again.
2. Certain vegetarian food leftovers can be left to decompose to form compost to act as an additional source of fertilisers.
3. Our faeces can be collected in a special bin to allow the methane inside the faeces to undergo combustion and to be converted into electricity.
4. Other types of waste eg: unused food waste will be thrown into a trashbin that will be collected every few days. The waste can be dumped at a dump site outside the biosphere.
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