desertification

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desertification Process by which a desert gradually spreads into neighbouring areas of semi-desert. The change may result from a natural event, such as fire or climatic change, but occurs most frequently as a result of human activity. Once vegetation is removed (usually by over-grazing or for firewood), the soil is easily eroded and the land rendered infertile.

http://www.unccd.int; http://www.fao.org/desertification

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