Thousands of people still live on the Indian island of Ghoramora, which has shrunk in size to just 4.5 sq km.
It’s one of scores of low-lying islands in the Sundarbans Delta that are rapidly disappearing.
Scientists say global warming has caused melting snow and ice to swell the rivers, and the sea level has risen.
Tens of thousands have fled Ghoramora in recent decades.
Video by Devina Gupta and Pritam Roy