- Atmospheric Sciences 12
- Civil Engineering 11
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 11
- Climate Change/Climate Change Impacts 10
- Hydrology/Water Resources 10
- Sustainable Development 9
- Geotechnical Engineering & Applied Earth Sciences 5
- Hydrogeology 5
- Computational Intelligence 4
- Earth Sciences, general 4
- Math. Appl. in Environmental Science 4
- Monitoring/Environmental Analysis 4
- Probability Theory and Stochastic Processes 4
- Remote Sensing/Photogrammetry 4
- Statistics for Engineering, Physics, Computer Science, Chemistry and Earth Sciences 4
- Environment, general 3
- Environmental Management 3
- Meteorology 3
- Forestry Management 2
- Geophysics/Geodesy 2