Natural resources are naturally occurring substances that are considered valuable in their relatively unmodified (
natural) form. A natural resource's value rests in the amount of the material available and the
demand for it. The latter is determined by its usefulness to production. A
commodity is generally considered a natural resource when the primary activities associated with it are extraction and purification, as opposed to creation. Thus,
mining,
petroleum extraction,
fishing,
hunting, and
forestry are generally considered natural-resource industries, while
agriculture is not. The term was introduced to a broad audience by
E.F. Schumacher in his 1970s book
Small is Beautiful.
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n. ทรัพยากรธรรมชาติ
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