Karachi—Polythene bags the greatest polluters of the environment causing serious sewerage problems as well they could be replaced only when the paper bags are made affordable.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/reduce-duty-sack-paper-can-replace-polythene-bags
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/pakistan-observer
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/plastics
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/dioxin
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/non-biodegradable-waste
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pakistan
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/south-asia