A bustling city — Kolkata produces almost 750 million litres of wastewater and sewage every day. Yet, the city’s main area does not have a single sewage-treatment plant. So where does all of Kolkata’s waste go? The answer is the East Kolkata Wetlands, the world’s only fully functional organic sewage management system. The East Kolkata Wetlands (EKW), designated a UNESCO World Heritage Site in 2017...
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