Just look at this picture. The amount of black smoke coming out of this bus. This was taken by a newsreporter when inspectors from the enviornment department were taking measurements on the amount of black smoke released by buses and trucks plying on the streets of Dhaka. However the government has taken a good step by introducing CNG(Compressed natural gas). On its introduction people were least bothered. At time went on people realized that CNG was cheaper than octane, fuel-efficient and only took some amount of money on converting petrol run engine into a CNG based engine.
Those of you are interested on the conservation of mother nature you should sign up for WWF ( I do not mean Wrestling but World Wide Fund) or other such agencies who car efor our only home planet Earth.