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PROCESSES OF DESERTIFICATION
THE CAUSES OF DESERTIFICATION
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Africa albedo Alice Springs animals annual areas arid lands Arid Zone atmosphere Australia belt Bowen ratio cent combat desertification conservation crops cultivation damage degradation desert desertification drainage drought dry climates dry ecosystems dryland dynamics ecological economic ecosystems effects energy environment environmental evaporation evapotranspiration farming fluctuations forage global grazing groundwater growth gullying herds impact improved increase intense irrigated agriculture irrigation labour Land-use system livelihood systems livestock long-term loss marginal methods migration models moisture nomadic numbers nutrients Pakistan pastoral pastoralists patterns plants population population densities precipitation pressure problems programmes radiation rain rainfall rainfed agriculture Rajasthan range rangeland reduce regions run-off Sahara Sahel saline savanna season semi-arid Semi-intensive settlements Shrublands slopes social solar South Australia species strategies sub-tropical surface techniques temperature traditional tropical UNESCO urban variations vegetation vulnerable watering points waterlogging West Africa wind yield