One doubt is running in my mind for past five years. For some of you people, this may look stupid too. But now I use this opportunity to disclose my doubt to the world. We always say that the fuel emissions from the auto mobiles are polluting the environment. The suggestion that we give to protect us from the pollution, is to avoid those fuel auto-mobiles to the best, we can do. Why not we should think in a different way? We all know that the waste water can be recycled and used. If this is possible, why the smoke from the bike and cars cannot be reconverted into the fuel? Neither I am the mechanical engineer, nor the expert in the auto-mobiles. So I don’t know the technical facts about this concept. But nothing is impossible for man. So let us wait for the time to answer my doubt.