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World Water Day: How “Sludge” Can Power China’s Cities While Cutting Emissions
World Water Day: How “Sludge” Can Power China’s Cities While Cutting Emissions
Last December, Beijing’s city government issued a “red alert” for smog levels—the highest possible designation. Schools and construction sites closed, traffic was restricted, and air pollution reached 10 times the World Health Organization’s recommended limit. Meanwhile, residents in neighboring cities ...