The Unesco has designated Nicobar Islands as a world biosphere reserve under its ‘Man and the Biosphere Programme’.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/unesco-designates-nicobar-%E2%80%98world-biosphere-reserve%E2%80%99
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nicobar-islands
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/unesco
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biosphere-reserves
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sustainable-development