The fuel cell is probably the most practical and viable option available right now. In the meantime, we don't have to give up on the internal combustion engine in order to stop or reduce pollution and our dependence on a non-renewable resource. We can burn other things besides gasoline. Bio-fuels are being researched and they are also being used in greater quantities lately. In the Midwest, methanol is added to gasoline.
Methanol is produced mostly from corn.
It can also be produced from any agricultural waste products. Methanol is a much simpler hydrocarbon than gasoline and will put less toxic emissions into the atmosphere. We can expect to see an increase in the use of methanol to power our engines over the next several years. The funny thing about bio-fuel is that it is old technology. It is as old as petroleum fuel technology.