American Coal Production and Use

mechanical energy including petroleum, natural gas, and improved harnessing of falling water, yet all these fall far short of the total energy derived from coal. The great amount of energy stored in coal is not the work of a few years but the product of millions of years of energy stored by the sun. It has been said that one pound of good coal, when burned in an engine, is equivalent to the work one man can do in a day. Granting this to be reasonably true, the amount of energy taken yearly from the mines of the world is incomprehensible to most of us. So vastly important is coal in our modern world that no people or nation can hope to compete with the leading nations of the world unless it has the use of ample stores of good coal

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