Composting provides an environmentally sound method of waste disposal because it relies on natural biological processes under controlled conditions. Composting can reduce the volume of materials by 30-60 percent. Landscape trimmings are made into a variety of soil amendments and mulches which help to keep weeds out and moisture in. Steel More than two-thirds of the amount of steel produced each year is recycled, making steel the most actively recycled material. Beyond the large volume of steel recycled each year, all steel products are guaranteed to have recycled content because new steel is made from old steel.
Steel is also a green framing material in sustainable home development, as is steel roofing.
16 percent are reused, exported, or retreaded. Tires are also used in building construction, erosion control, artificial marine habitats, crash barriers, and playground equipment. Used Oil and Antifreeze Used motor oil is re-refined into new motor oil, as well as transmission fluid and lubricating oils of very high quality. It takes three gallons of used motor oil to produce one gallon of re-refined motor oil, compared to using 75 gallons of crude oil just to make one gallon of virgin motor oil. Used antifreeze is also re-refined for reuse.