Capturing waste heat in a thermal-electric plant can increase efficiency from 30 percent to 80 or 90 percent.
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Q37: _ is being used to produce ethanol
Q38: Which of the following is NOT normally
Q39: Very few living trees are cut down
Q40: Parabolic mirrors _ sunlight on a collecting
Q41: Mixing ethanol with gasoline makes the gasoline
Q43: United States companies currently dominate the $1
Q44: Siltation and decreased water quality are especially
Q45: Geothermal energy uses _ to produce usable
Q46: Tidal power stations operate by using
A) The
Q47: Improving standards of living have been repeatedly
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