Recycling is the re-use of materials that would otherwise be considered waste. Those materials can be sources from pre-consumer waste (materials used in manufacturing) or post-consumer waste (materials discarded by the consumer).
Articles about, or including aspects of, recyling:
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... stay separate until 1816, when they would form the kingdom of Two Sicilies. The two kingdoms were conquered by Spaniards in 1501, who held them until 1734, when they ...