Crop residues like wheat straw and corn stover
Links:
[1] http://admin.indiaenvironmentportal.org.in/reports-documents/finding-balance-agricultural-residues-ethanol-and-environment
[2] http://admin.indiaenvironmentportal.org.in/category/author/liz-marshall
[3] http://admin.indiaenvironmentportal.org.in/category/author/zachary-sugg
[4] http://admin.indiaenvironmentportal.org.in/category/publisher/world-resources-institute
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/crop-residues
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ethanol
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biomass
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biofuel
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/energy
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-states-america-us
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/agriculture