There are lots of different ways to make Rayon. Some options are more sustainable than others. For instance, Rayon, which is made from eucalyptus or bamboo, is a good option. These plants grow quickly and are certified as sustainable sources. Even so, the chemical treatments can be problematic. But if you opt for versions that have minimal layers of chemicals, then Rayon can work out to be a reasonably neutral option in terms of environmental impact.