We thought Composting would be good for the planet, but large cities face a huge logistical challenge to keep recycling large-scale collection of food scraps, yard trimmings, and worse.

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Seoul, South Korea, proves it can be done by recycling 95% of its food waste.  Meanwhile, sites in Sweden, California, and New York are saving money by turning egg shells and carrot tops into biogas. What are cities near you doing to protect the environment and to recycle garbage or compost and turn the by-products into useful resources?