Hellman begins with a look into the future when coal has just joined oil and gas as a chemical raw material too precious to be burned for fuel and the energy needs of the population are met by solar heating and by a troublesome supply of fusion produced electricity. In Section Two, ""Energy is Everything,"" he properly points out that energy is the basis of advanced civilization and that its supply must be secured through a combination of economy and research if civilization is to continue and develop. He then surveys the limits and possibilities of the well known sources of energy (coal, oil, water power, natural gas, nuclear energy, etc.) and of the more speculative possibilities which have been suggested. These latter are described carefully and somewhat optimistically but without taking off into the heady atmosphere of science fiction. Mature and timely.