Gallery: 8 Overarching Urban Systems That Make a City Sustainable


5: Recycling, upcycling and closing the loop of “stuff”.

Much like a living organism, a city has energy and resources flowing in, and waste and pollution flowing out. The key here is to try to upcycle that waste to become part of the energy and resources stream, thereby closing the loop of the urban metabolism. An example is to use household waste to fuel power plants, which in turn fuel the city, which in turn produces sewage that is used to start the cycle over again.

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