It's the white plastic pipe that carries away the water when you empty the bathtub.Maybe it's in your home's vinyl siding,your wallpaper,or the beachball your son plays with.The material is polyvinyl chloride (PVC),one of the world's most widely used plastics and,increasingly,one of its most controversial.The chemical properties that give it such flexibility and a long serviceable life also make it an environmental liability when it's produced and later when it's thrown out.
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