Acetate can be made without fossil fuels from plant fibers, making it a step more eco-friendly than new plastics; however, it does require energy and chemicals to produce. Its flexibility and durability are why so many eyewear companies use it. Acetate is more eco-friendly than new plastic, and even greener options would be bio-acetate, recycled plastic, wood, metals, and cork as long as it’s sustainably sourced. If buying acetate frames, look for acetate that is listed as bio-acetate or made without synthetic plasticizers that contain phthalates. It’s also good to look for acetate frames made by highly transparent and ethical companies that ensure workers have proper ventilation and protective clothing.