Rayon can be bad for the environment in two ways. One, its production rely on wood pulp, resulting in the cutting down of old growth forests in some parts of the world to operate rayon mills. Two, rayon is produced through the process of viscose, which utilizes harmful chemicals such as caustic soda, and produces carbon disulfide as a byproduct.
Yes. Apparently turning wood into rayon is wasteful, because a great deal of water and chemicals are needed to extract usable fibers from trees. However, only about a third of the pulp from the tree will end up in finished rayon thread. Additionally, the fabric usually require dry cleaning, which is an environmental concern, because chemicals used in the dry cleaning process can be very toxic.
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