Press Trust of India: Global warming and consequent rise in the sea level is posing a threat to the population, turning them into ‘environmental refugees,` in the Sunderbans, the largest delta region in the world. Ocean scientists say the islands of Lohachara and Suparibhanga have been submerged . Erosion and submergence have been taking place in 12 sea-facing southern islands of the Sunderbans, putting at risk the lives of thousands of people and wildlife. A research team led by Professor Sugata …