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Nature protection --- Agriculture. Animal husbandry. Hunting. Fishery --- Deserts --- Zone aride --- Arid zones --- Geography --- Population humaine --- human population --- Plante --- plants --- Écologie --- ecology --- Aridoculture --- Dry farming --- Culture irriguée --- Irrigated farming --- Technologie appropriée --- Appropriate technology --- Troupeau --- Herds --- Oasis --- Oases --- Oases.