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In page Deforestation:

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The massive use of charcoal on an industrial scale in Early Modern Europe was a new type of consumption of western forests.[15] Each of Nelson's Royal Navy war ships at Trafalgar (1805) required 6,000 mature oaks for its construction.[citation needed] In France, Colbert planted oak forests to supply the French navy in the future. When the oak plantations matured in the mid-19th century, the masts were no longer required because shipping had changed.[16]