- Science, Humanities and Social Sciences, multidisciplinary 9
- Science, multidisciplinary 9
- Ecology 5
- Geochemistry 5
- Terrestrial Pollution 5
- Biogeosciences 4
- Environment, general 4
- Environmental Science and Engineering 4
- Geology 4
- Hydrology/Water Resources 4
- Natural Hazards 4
- Plant Sciences 4
- Forestry 3
- Nanoscale Science and Technology 3
- Nanotechnology 3
- Applied Ecology 2
- Behavioral Sciences 2
- Ecosystems 2
- Environmental Management 2
- Evolutionary Biology 2