Similarly, solar thermal energy--which harnesses the heat of the sun to generate steam-powered turbines--consumes more than 2, 600 liters of water per megawatt hour, 200 liters more than coal-powered generation needs to produce the same energy.

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Slingshot is a vapor-compression water-purification machine that can produce about 30 liters of 100% pure distilled water per hour using the same power as a hair dryer consumes.

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