47. Solar panels and windmills are commonlyreported as symbols of _______
48. The massive industrial plant fittedwith special equipment to recycle energy can reduce power costs as well as_______,
49. Instead of producing more energy, theUnited States could compensate the future projected growth in electricity demandby _______.
50. The equipment added by Recycled EnergyDevelopment is used to trap the heat to produce stream from _______.
51. According to Casten, whatdifferentiates the method of waste energy recycling from some other cleanenergy options when dealing with CO2 emissions?

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