- Ecotoxicology 7
- Atmospheric Protection/Air Quality Control/Air Pollution 6
- Environment, general 6
- Environmental Chemistry 6
- Environmental Health 6
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 6
- Agriculture 3
- Soil Science & Conservation 3
- Ecology 2
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- Environmental Engineering/Biotechnology 1
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- Geoecology/Natural Processes 1
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- Natural Hazards 1
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