Windows manufactured from biodegradable material are considered less harmful to the environment because of their ability to break down in to mostly water, carbon dioxide and organic matter relatively quickly, by biological means, and disappear into the environment as solids biodegrading into the soil. By contrast, a plastic window will stay intact for many years in a landfill and will not compost. The vast majority of Plastic window envelopes end up in the landfill because of the unavailability of recycling programs equipped to deal with the dual  materials (paper and plastic) which comprise the make- up of the product. By biodegradable window material, the entire envelope will degrade.