This city’s sleek, European-made subway cars, riding on rubber tires that barely make a noise on the steel rails, carry 2.4 million passengers a day during the week in a metro system considered South America’s most modern. Now it has another distinction: It is about to become one of the first subways in the world to get most of its energy from sun and wind, part of a rapid expansion of renewables that has taken
This city’s subway system will soon run mostly on renewable energy
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