- Science, Humanities and Social Sciences, multidisciplinary 12
- Science, multidisciplinary 12
- Ecology 9
- Environment, general 5
- Forestry 5
- Plant Sciences 5
- Life Sciences, general 4
- Agriculture 3
- Biogeosciences 3
- Biological and Physical Anthropology 3
- Ecosystems 3
- Evolutionary Biology 3
- Hydrology/Water Resources 3
- Paleontology 3
- Zoology 3
- Climate Change 2
- Climate Change/Climate Change Impacts 2
- Conservation Biology/Ecology 2
- Earth Sciences, general 2
- Environmental Law/Policy/Ecojustice 2