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- Desertification
- Range ecology 3
- Soil degradation 3
- Breeding 1
- Camel milk 1
- Camels 1
- Climatic changes 1
- Communicable diseases 1
- Congrès 1
- Desert ecology 1
- Désertification 1
- Emigration and immigration 1
- Environmental conditions 1
- Global warming 1
- Human ecology 1
- Nuclear disarmament 1
- Nuclear energy 1
- Pollution 1
- Power resources 1
- Renewable energy sources 1
- Sand dune conservation 1
- Sand dune ecology 1
- Social conditions 1
- Terrorism 1
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