“Where Does Road Salt Come From?” for National Geographic

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Road salt use in the U.S. exceeded 17 million tons in 2013. This year cities, states, and municipalities across the country are clamoring for more salt due to a particularly severe winter. New York City is replenishing its supplies this month with large shipments from Chile.

Video produced, shot and edited by Eileen Mignoni and Nacho Corbella for National Geographic.