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Drought --- Desertification. --- Desertification --- ecology --- precipitation. --- precipitation --- Climatic change --- Water resources --- world --- Asia --- Africa --- South America --- Australia

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Water resources --- resource management --- Sustainable development --- Watersheds --- Watershed management --- water management --- Irrigation --- Drought --- Soil water balance --- Models

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Arid regions ecology --- Droge streken--Ecologie --- Ecologie des régions arides --- Régions arides--Ecologie --- Arid regions. --- Desertification. --- Droughts. --- Environmental degradation. --- Human beings --- Environmental Sciences and Forestry. Soil Science --- Effect of environment on. --- Land degradation and Land conservation --- Land degradation and Land conservation. --- Arid regions --- Desertification --- Droughts --- Environmental degradation --- Environmental effects on human beings --- Human ecology --- Nature and nurture --- Degradation, Environmental --- Destruction, Environmental --- Deterioration, Environmental --- Environmental destruction --- Environmental deterioration --- Natural disasters --- Environmental quality --- Drought --- Drouth --- Drouths --- Weather --- Aridization of land --- Desertization --- Climatology --- Deserts --- Arid lands --- Arid zones --- Dry lands --- Dryland regions --- Drylands --- Lands, Arid --- Regions, Arid --- Regions, Semiarid --- Semi-arid regions --- Semi-arid zones --- Semiarid regions --- Sub-humid lands --- Zones, Arid --- Extreme environments --- Effect of environment on --- Human factors --- DESERTS --- DROUGHT --- ARID REGIONS --- WIND EFFECTS --- ANTHROPOGENIC EFFECTS --- IRRIGATION --- DESERTIFICATION --- GEOGRAPHY --- SOIL STRUCTURE --- HYDROLOGY --- WIND --- CONTROL

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Plant ecology. Plant sociology --- Plant physiology. Plant biophysics --- Plant ecophysiology. --- Plante --- plants --- Relation plante sol --- plant soil relations --- Relation plante eau --- Plant water relations --- Bilan hydrique --- water balance --- Physiologie végétale --- Plant physiology --- Résistance à la sécheresse --- Drought resistance --- Photosynthèse --- Photosynthesis --- Métabolisme des minéraux --- Mineral metabolism --- Phytoécologie --- plant ecology --- ECO Ecology --- ecology --- environmental factors --- mineral nutrition --- plant ecophysiology --- stress --- water relations --- Plant ecophysiology --- Relation plante atmosphere

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Migration, Internal --- Droughts --- Famines --- Refugees --- Demography --- Business & Economics --- Famine --- Food supply --- Starvation --- Drought --- Drouth --- Drouths --- Weather --- Internal migration --- Mobility --- Population geography --- Internal migrants --- Sudan --- Sudan, Egyptian --- Anglo-Egyptian Sudan --- Anglo-Egipetskiĭ Sudan --- Egyptian Sudan --- Democratic Republic of the Sudan --- Republic of the Sudan --- Jumhūrīyat al-Sūdān al-Dīmuqrāṭīyah --- Soudan --- Demokraticheskai︠a︡ Respublika Sudan --- Sudan (Democratic Republic) --- Jamhuryat es-Sudan --- Republic of Sudan --- Jumhūriyyat as-Sūdān --- Jumhuriyat as-Sudan --- As-Sudan --- Lado Enclave (Congo Free State) --- History, Military. --- Economic conditions. --- Social conditions.