Many of the world’s largest and most vibrant cities may soon vanish from the map. Nature is preparing to reveal its most dangerous face, and coastal megacities such as Shanghai, Karachi, and Dhaka are now staring at the prospect of a ‘watery grave’.

A new and alarming study warns that delta-based cities are becoming increasingly unsafe: the land beneath them is sinking while sea levels continue to rise. Scientists argue that this deadly combination is as catastrophic as a nuclear blast. Without urgent changes to their flood-management strategies, these cities may experience devastation similar to what struck New Orleans during Hurricane Katrina.

This research, published in the journal One Earth , has sparked global concern. Experts say cities like Shanghai depend heavily on sea walls a

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