Water, the coal of the future
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.
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Context: Asked what the world will burn once its coal runs out, the engineer gives his answer.
Not in a duel yet
Source: Part 2, Chapter 11