When Mumbai came to a standstill after days of relentless rain this week, the images were all too familiar — flooded roads, stranded commuters, delayed trains, and neighbourhoods struggling to stay afloat. 

Across India, intense cloudbursts and short bursts of heavy rainfall are becoming more frequent, exposing the limits of concrete drains and ageing urban infrastructure.

But hundreds of kilometres away, Kolkata offers a different lesson.

On the eastern edge of the city lies a 12,500-hectare stretch of wetlands that quietly absorbs excess rainwater, naturally treats sewage, supports thousands of livelihoods, and protects the city from flooding. 

Known as the East Kolkata Wetlands (EKW), this remarkable ecosystem proves that sometimes, the smartest climate solution isn't built with cement — it's already growing in nature.

Nature's sponge for a growing city

Often called the "natural kidneys" of Kolkata, the East Kolkata Wetlands work much like the human body. Just as kidneys filter waste from........

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