- Ecotoxicology 5
- Environment, general 5
- Environmental Chemistry 5
- Environmental Health 5
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 5
- Atmospheric Protection/Air Quality Control/Air Pollution 4
- Oceanography 2
- Cell Biology 1
- Earth Sciences, general 1
- Evolutionary Biology 1
- Geography, general 1
- Life Sciences, general 1
- Microbiology 1
- Plant Sciences 1
- Pollution, general 1
- Sedimentology 1
- Soil Science & Conservation 1
- Urban Geography / Urbanism (inc. megacities, cities, towns) 1
- Zoology 1