Exam 16: Energy Efficiency and Renewable Energy

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Tapping just 2% of the hot, dry rock geothermal energy in the U.S.could produce how much of the energy needed by the U.S.?

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The average fuel efficiency of U.S.cars has improved by how much since 1908?

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Producing ethanol using switchgrass produces more than 5 times as much energy as it takes to grow it, far more than corn based ethanol.

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