Alternative fuels employed in road transport: Compressed Natural Gas (CNG), Liquefied Petroleum Gas (LPG), Methanol and Blended/ Ethanol and Electricity. The main objective to introduce CNG as transport fuel in Pakistan was, natural gas being an indigenous energy resource: lessens the import bills; availability, secure energy supplies; robust infrastructure; energy security; environmentally cleaner than liquid fossil fuels.
Links:
[1] http://admin.indiaenvironmentportal.org.in/reports-documents/cng-environment-friendly-transport-fuel-success-story-pakistan
[2] http://admin.indiaenvironmentportal.org.in/category/author/hilal-raza
[3] http://admin.indiaenvironmentportal.org.in/category/author/nasreen-farah
[4] http://admin.indiaenvironmentportal.org.in/category/publisher/clean-air-initiative-asian-cities-center
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/alternative-fuels
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cng
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/diesel
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cng-buses
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/transport
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industry
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pakistan
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/global