The fact that blue jeans typically need only a passing acquaintance with the washing machine has always been a point in their favor. But even if they rarely see the inside of a laundromat, blue jeans have one of the largest water footprints of any clothing material. Cotton by nature is an incredibly thirsty crop, and the cotton used to make denim often grows in some of the world’s driest regions.
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Source: Phys.org