Recycling is the processing of waste materials into new products. Recycling aims to limit the loss of potentially useful materials, reduce the consumption of new materials, lower energy usage, reduce potential air pollution from the incineration of garbage, reduce water pollution produced by landfill by reducing the need for ‘conventional’ waste disposal methods, and lower the emissions of greenhouse gases in comparison to the potential emissions created in the production of new goods. The fourth component of the ‘waste hierarchy’, the others being ‘avoid’, ‘reduce’ and ‘reuse’, recycling is a key component in modern waste reduction. See also Corporate Social Responsibility and Sustainability.