Dr Hazra had estimated back in 2002 that 69,000 people will have to move from the Sundarbans by 2020 because of climate change. This figure, he says, has already crossed 60,000. "People who are not responsible for climate change are the worst sufferers of climate change," he says.
Near Ms Bibi's house, children play football on the vast coastal tract cleared by the encroaching sea. Decapitated palm stumps, some with their gnarled roots exposed, dot the scene. A playground at low tide, it turns a watery graveyard at high tide. And while the living drown, the dead are woken up - a local graveyard is inundated regularly, bringing up pieces of skeletons.
Before the next deluge sets in, Mr Sheikh Sofi is evacuating his frugal belongings. He pegs tarpaulins to the house in a vain attempt to prevent the waters from coming in. "Today there was knee-deep water in my house. I cannot stay here another night, my children will be washed away," he says hurriedly.
For now, he is moving to a relative's house. In the long run, he is certain of becoming a climate refugee all over again. "This house was built in 2008 after I lost my earlier house," he adds, pointing in the direction of the sea.