Links:
[1] http://admin.indiaenvironmentportal.org.in/news/business-scores-over-environment-sikkim
[2] http://admin.indiaenvironmentportal.org.in/category/thesaurus/teesta
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/hydroelectricity
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/national-hydroelectric-power-corporation-nhpc