Recently a number of objections have been raised against the use of ethanol produced from agricultural products such as maize, sugarcane, wheat or sugar beets as a replacement for gasoline, despite some of their advantages such as being cleaner and to some extent renewable. We address these...

A discussion is presented on the possibilities of supplying the energy needs of the world and particularly of the developing countries on the basis of renewable resources: hydro power and biomass. Hydro power is found to be underused in many parts of the developing countries and, up to the end...