- Agriculture 3
- Agricultural Economics 2
- Plant Sciences 2
- Public Health 2
- Terrestrial Pollution 2
- Climate Change 1
- Engineering, general 1
- Environment, general 1
- Nuclear Fusion 1
- Nuclear Medicine 1
- Nuclear Physics, Heavy Ions, Hadrons 1
- Physical Chemistry 1
- Sustainable Development 1
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 1
- Water Industry/Water Technologies 1