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If you don’t change direction, you will end up where you are heading,” said Lao Tzu, the father of Taoism. Where are we heading? Energy use is projected to climb to 629 quad BTUs by 2020, and 813 quad BTUs by 2040. The global emissions of CO 2 doubled from 1975 to 2015, and are projected to triple by 2040 if we stay on our present course4.
Energy experts have been warning that electricity is likely to get more expensive and less reliable unless renewable power that waxes and wanes under inconstant sunlight and wind is backed up by generators that can run whenever needed. The glamorous vision has inspired numerous futuristic proposals. But nature gets a vote.
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