Word: flat-roofed
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...travel to the Alaskan North Slope or the shores of the Caspian Sea to find new sources. The sunlight falling on the surface of the earth each day contains 6,000 times as much energy as is used by all countries combined. Studies show that covering the existing flat-roof space of many cities with solar cells could meet half to three-quarters of their electricity needs. In the U.S., North Dakota, South Dakota and Texas together are swept by sufficient wind to meet the electricity needs of the entire country...
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