- Sustainable Architecture/Green Buildings 5
- Computational Intelligence 3
- Computer Applications 3
- Renewable and Green Energy 3
- Energy Materials 2
- Energy Policy, Economics and Management 2
- Environmental and Sustainability Education 2
- Waste Water Technology / Water Pollution Control / Water Management / Aquatic Pollution 2
- Building Construction and Design 1
- Energy Efficiency 1
- Public Policy 1
- Sustainable Development 1
- Urban Ecology 1