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To figure this out, the researchers imagined three scenarios for the Sahara and the Sahel , a semi-arid region immediately to the south. In one, the area is studded with wind turbines that stand more than 300 feet high. In another, solar panels cover 20% of the land. The third case combines wind and solar farms — a setup that would produce about 82 terawatts of electrical power. That’s far more power than the world currently needs, said study co-leader Yan Li. Once their hypothetical energy farms were built, the researchers fed the details into a sophisticated computer program that http://shoppingmarto8zh.savingsdaily.com simulates Earth’s dynamic climate. Then the program made predictions about how the farms would change the environment. An aerial view of the solar mirrors at the power plant in Morocco. (Fadel Senna / AFP/Getty Images) In the case of wind farms, the giant turbines would cause warmer air from above to mix with cooler air below, bringing more heat close to the surface. Air temperatures near the ground would increase by nearly 4 degrees Fahrenheit.
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