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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