in the past few years scientists have found several new fuels to replace gasoline for automobiles
one of these fuels is methanol a form of wood alcohol
it can be used in many cars in almost the same way that gasoline is used
natural gas is another alternative fuel for cars
however cars that burn this fuel must be equipped with special tanks of natural gas
a third alternative is electricity
cars fueled by electricity have no engine at all though they do have to carry large batteries
a fourth mew energy source and perhaps the most promising is the hydrogen fuel cell
hydrogen is available in large quantities and the fuel cell is only emission is a small amount of water