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The Rational Optimist: How Prosperity Evolves, by Matt Ridley

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Most of Arizona gets about six kilowatt-hours of sunlight per square metre per day so, assuming 12 per cent efficiency, it would take about one-third of Arizona to supply Americans with all their energy:
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The Rational Optimist: How Prosperity Evolves
The Rational Optimist: How Prosperity Evolves
by Matt Ridley
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