Wind and dust fences are needed in some desertification and erosion-prone regions. They moderate wind erosion by slowing down the wind, which shelters soil from being blown away with it. Such fences generally consist of lightweight materials which are porous making, they let through wind while trapping sand and dust paticles to a high degree. These fences are both a good method for wind-blown sand and dust control at low cost plus environmentally-friendly too.