- Environment, general 55
- Ecotoxicology 23
- Atmospheric Protection/Air Quality Control/Air Pollution 21
- Environmental Chemistry 21
- Environmental Health 21
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 21
- Earth Sciences, general 17
- Ecology 17
- Geography, general 14
- Materials Science, general 9
- Classical Mechanics 8
- Life Sciences, general 8
- Mathematical and Computational Engineering 8
- Mechatronics 8
- Environmental Management 3
- Environmental Physics 3
- Soil Science & Conservation 3
- Chemistry/Food Science, general 2
- Engineering, general 2
- Sustainable Development 2