Sewage is pouring out of cities. Approximately 30 billion tons of urban wastewater are discharged a year. However, only less than 25 percent of it is properly treated, experts said.The blame for this...
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Sewage is pouring out of cities. Approximately 30 billion tons of urban wastewater are discharged a year. However, only less than 25 percent of it is properly treated, experts said.The blame for this...