Stubble burning creates a huge environmental problem and farmers of Punjab are aware of it but still resort to this practice, saying their is no viable alternative available.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/viable-alternative-emerges-burning-paddy-straw-punjab
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/business-standard-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environmental-security
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/farmers
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wwf
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/haryana
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment