hydrogen (produced from non-fossil primary sources of energy) will answer the above problems. Hydrogen, as the fUel of the post-fossil-fUel era, was pre­ dicted more than a hundred years ago by that great forecaster of the future, Jules Verne, in his novel The Mysterious Island: Water decomposed into its primitive elements, and decom­ posed doubtless by electricity, which will then have become a powerful and manageable force. . . . Yes, my friends, I believe that water will one day be employed as fuel, that hydrogen and oxygen, which constitute it, used singly or together, will furnish an inexhaustible source of heat and light of an intensity, of which coal is not capable .. .. I believe, then, that when the deposits of coal are exhausted, we shall heat and warm ourselves with water. Water will be the coal of the future.