| http://www.w3.org/ns/prov#value | - Even in the Mediterranean region, with large irrigated areas, 60% of the cereal production comes from rainfed cropping (Parry et al. 2005).Clearly, at a regional scale, the major problems in water supply are in regions with low rainfall, yet high evaporative demand, and those with expanding populations, such as North Africa, Southern Africa and the Near East, where water availability is less than
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