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What Needs to Happen Before Electric Cars Take Over the World

Edwin Stafford charges his Tesla at an electric charging station in Mountain View, Calif., Aug. 8, 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. (Jason Henry/The New York Times)