Fact: Thanks to numerous innovations, we now produce about twice as much output per unit of energy as we did 50 years ago, and five times as much as we did 200 years ago. Automobiles use only half as much metal as in 1970, and one optical fiber carries the same number of calls as 625 copper wires did 20 years ago. Bridges are built with less steel, because steel is stronger and engineering is improved. Automobile and truck engines consume less fuel per unit of work performed, and produce fewer emissions. . . .
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