Globally Important Ingenious Agricultural Heritage Systems (GIAHS): extent, significance, and implications for development
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Agroecosystems cover more than one quarter of the global land area, reaching about 5 billion hectares. Agroecosystems are ecosystems in which people have deliberately selected crop plants and livestock animals to replace the natural flora and fauna. The document describes five criteria which can be used to classify agroecosystems in a region and based on these criteria, it is possible to recognize seven main types of agricultural systems in the world.