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sparse and variable
Instability and promise
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advance Africa agricultural America amount animal applied areas arid and semi-arid arid lands arid zone research Australia basin brackish breeding camel carry centre changes cities climate cloud concentrations costs countries crop desert locust drought dry lands economic effects efforts Egypt erosion estimates evaporation farmers field flood flow grass grasslands grazing ground water growth heat human humid hydrologic cycle improve India institutions irrigated lands Karachi Kuwait major project means measures Mediterranean ment millimetres mineral moisture Morocco natural nomads Organization Pakistan period Photo plant ecology plant nutrition Plate population potential evapotranspiration practical precipitation processes production Quetta rain rainfall range region Sahara salinity salt scientific scientists sectors semi-arid soil and plant soil profile soil salinity solar energy solonchak South Africa south-west Asia sparse species storage stream supply surface Tartous temperatures tion toxic limits transpiration Unesco United valley workers