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What Needs to Happen Before Electric Cars Take Over the World

Exploratory drilling, searching for lithium, in Cinovec, Czech Republic, Aug. 15, 2017. Prices for lithium-ion batteries are plummeting and technical advances are increasing driving ranges and cutting recharging times: Faster than anyone expected, electric cars are becoming as economical and practical as cars with conventional engines. (Gordon Welters/The New York Times)