Recycling is a process to change (waste) materials into new products to prevent waste of potentially useful materials. Reducing the consumption of fresh raw materials, reducing energy usage, reducing air pollution (from incineration) and water pollution (from landfilling) by reducing the need for "conventional" waste disposal. Greenhouse gas emissions are lower compared to plastic production.
Recycling is a key component of modern waste reduction and is the third component of the concept, "Reduce, Re-use and Recycle", waste hierarchy.
There are some ISO standards related to recycling for plastics waste and for environmental management control of recycling practices.