Most people associate recycling with items such as newspapers, magazines, plastics, aluminum, and glass. The recovery, reprocessing, and reuse of materials from used items is called external recycling and requires public participation.
A second type of recycling, internal recycling, is the reuse of waste materials from manufacturing and does not involve the general public. For example, the manufacture/production of copper items results in wasted copper pieces; with internal recycling, these pieces are melted down and recast. Although internal recovery is possible in many industries, it is most common in the metal industry.
Because industrial waste accounts for 98 percent of all waste in the United States, many critics of recycling advocate that more attention should be paid to internal recycling than external recycling.
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