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Satellite imagery shows that the sea level in the Sundarbans has risen at an average rate of 3.14 centimetres a year over the past two decades - much higher than the global average of two millimetres a year.
Tree-felling during the past century has more than halved the mangrove cover in the Indian section as successive administrations allowed rampant land reclamation for human settlement.
Since the first settlements in 1770, the population of the Indian Sundarbans has risen 200% to nearly 4.3 million.
The population has put pressure on the ecosystem, which acts as a nursery for the aquatic resources of the Bay of Bengal.
Professor Hazra says mangrove depletion will increase the threat of flooding upstream in Calcutta. "It is an ecological disaster in the making," he says.