- Atmospheric Protection/Air Quality Control/Air Pollution 6
- Ecology 6
- Forestry 5
- Agriculture 4
- Science, Humanities and Social Sciences, multidisciplinary 4
- Environment, general 3
- Hydrogeology 3
- Science, multidisciplinary 3
- Climate Change/Climate Change Impacts 2
- Environmental Management 2
- Forestry Management 2
- Natural Hazards 2
- Atmospheric Sciences 1
- Climate Change 1
- Coastal Sciences 1
- Ecosystems 1
- Environmental Geography 1
- Fossil Fuels (incl. Carbon Capture) 1
- Freshwater & Marine Ecology 1
- Geoecology/Natural Processes 1