Economic Importance of Plants
Plants are extremely important in the lives of people throughout the world. People depend upon plants to satisfy such basic human needs as food, clothing, shelter, and health care. These needs are growing rapidly because of a growing world population, increasing incomes, and urbanization.
Plants provide food directly, of course, and also feed livestock that is then consumed itself. In addition, plants provide the raw materials for many types of pharmaceuticals, as well as tobacco, coffee, alcohol, and other drugs. The fiber industry depends heavily on the products of cotton, and the lumber products industry relies on wood from a wide variety of trees (wood fuel is used primarily in rural areas). Approximately 2.5 billion people in the world still rely on subsistence farming to satisfy their basic needs, while the rest are tied into increasingly complex production and distribution systems to provide food, fiber, fuel, and other plant-derived commodities. The capability of plants to satisfy these growing needs is not a new concern. The Reverend Thomas Malthus (1766-1834) in his Essay on the Principle of Population in 1798 argued that population growth would exceed nature's ability to provide subsistence. According to the U.S. Census Bureau, the world population was about one billion in 1800, doubled to two billion in 1930, doubled again to four billion in 1975, and reached six billion people in 2000.
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