Flying from New York to Melbourne in 1958, on a propeller plane, consumed more energy per person than my 2010 flight did, but it was "greener" nevertheless.

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If its energy consumption per person also rose to current South Korean levels, its energy demand would quadruple.

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Energy use per person is one of the most accurate indicators of what is considered prosperity and happiness.

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Since the beginning of the Industrial Revolution, energy consumption per person in the U.S. has crept ahead at 3% per year.

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The increase alone would be greater than America's total consumption today, yet China's energy use per person would still be only half that in America.

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As a thought-experiment, let's imagine that technology switches and lifestyle changes manage to halve American energy consumption to 125 kWh per day per person.

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America guzzles more petrol per person than any other big country, and uses more energy to produce each unit of economic output than most of its rivals.

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