Cashmere sweaters have become widely available at surprisingly low prices, offering consumers access to a fiber prized for its softness, warmth, and lightweight feel. But behind these bargains is a growing sustainability problem.  Cashmere comes from the fine undercoat of specific goat breeds, and each goat typically produces only four to six ounces of usable fiber per year through two shearings. As demand has surged and prices have fallen, herders have been pressured to she