The authorities of Munroe Thuruth Gram Panchayat, under which these islands fall, and political activists have sought assistance from global conservation organisations to deal with the "alarming" situation.
Panchayat officials said the shrinking tiny islands, ranging from one acre to over one hectare, were inhabited by humans. But now people were leaving these tiny islands as they find it very difficult to survive here as saline water has invaded the localities.
"We have decided to adopt a sustainable way to save the islands from saline waters encroaching the small land areas in the lake. We think that planting mangroves around the islands will help us to save these scenic areas," he said.
"These small islands are shrinking fast," K Madhu, a political activist, told PTI pointing towards tiny islands during a boat journey through the confluence of Ashtamudi Lake and Kallada River in which Munroe Island is located.
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"We need advice and assistance from global conservation organisations like IUCN to protect these islands from impact of global warming," said former Rajya Sabha M P K N Balagopal, who had taken up the issue with the Union government and environmental organisations like Centre for Science and Environment (CSE) in New Delhi.
"Sea levels set to rise far more rapidly than expected. So we need aid from centre and global conservation organisations to save the sinking islands," he said.
As Rajya Sabha member, he had sought Prime Minister Narendra Modi'sintervention to save the Munroe island, Balagopal said, adding former Environment Minister Prakash Javadekar had deputed an official team to study the situation.
He said "special care" from the Centre was required to protect the lives of 15,000 people living in Munroe island, which is being hit by increasing level of saline water.