Every once in a while you hear about how amazing something is, but it's not readily available. Why not? Conspiracy theorists say the government is holding it back because they get money by supporting the alternative we currently use. Years ago, corn fuel (AKA ethanol) was a good example of this. Why aren't all cars run on ethanol? It a renewable energy source and we wouldn't have to rely on foreign countries to get it. Of course, since then some negative side effects have become known: higher VOC's than gas and it creates more carbon dioxide during combustion. Trade-offs, I suppose.