Links:
[1] http://admin.indiaenvironmentportal.org.in/news/people-yet-understand-gravity-periyar-pollution-says-expert
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-thiruvananthapuram
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kerala
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/periyar
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/river-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industrial-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment-act-1986
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ernakulam
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution