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Materia
- Climatology and Climate Change 36
- History 36
- Area Studies 10
- Atmospheric Science and Meteorology 10
- Environmental Policy 6
- Economics and Law 5
- Ecology and Conservation 4
- Geography 4
- Philosophy 4
- Politics and International Relations 4
- Religion 4
- Anthropology 3
- Environmental Science 3
- Natural Resource and Environmental Economics 3
- Earth and Environmental Science: General Interest 2
- Environmental Law 2
- Literature 2
- Sociology 2
- Agriculture 1
- Comparative Politics 1