The high impact comes from the heavy water needs for mulberry trees as well as eutrophication in the silk filament production stage. The Higg MSI offers scores per kilogram of material. As silk fabrics tend to be lightweight, the overall product impact differences can have a lower impact than the Higg MSI score conveys (as all materials in Higg MSI are on a per kg basis). The Higg Product Module (Higg PM), which assesses product designs and completed products, provides impact results for specific amounts of materials used in a product.
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