Subject
desertification
12
climatic change
5
Desertification.
4
Desertification
3
Range ecology.
3
Soil degradation.
3
air pollution
3
degradation
3
erosion
3
soil pollution
3
soil protection
3
water
3
water pollution
3
climate modification
2
climatology
2
coastal region
2
environmental impact
2
environmental research
2
forest
2
hydrology
2
landscape
2
river
2
soil
2
soil chemistry
2
soil science
2
vegetation
2
Arid regions agriculture -- Environmental aspects.
1
Camel milk
1
Camels
1
Climatic changes
1
Communicable diseases
1
Desert ecology
1
Desertification -- Government policy -- European Union countries.
1
Desertification -- Government policy -- Mediterranean Region.
1
Desertification -- Social aspects.
1
Droughts -- Social aspects.
1
Emigration and immigration
1
Global warming
1
Human ecology
1
Human ecology.
1
Land use -- Government policy -- European Union countries.
1
Land use -- Government policy -- Mediterranean Region.
1
Nuclear disarmament
1
Nuclear energy
1
Pollution
1
Power resources
1
Renewable energy sources
1
Sand dune conservation.
1
Sand dune ecology.
1
Terrorism
1
more ...