- Renewable and Green Energy 6
- Biomedical Engineering/Biotechnology 2
- Engineering, general 2
- Environment, general 2
- Environmental Engineering/Biotechnology 2
- Environmental Science and Engineering 2
- Fossil Fuels (incl. Carbon Capture) 2
- Industrial Pollution Prevention 2
- Waste Management/Waste Technology 2
- Analytical Chemistry 1
- Biotechnology 1
- Green Chemistry 1
- Industrial Chemistry/Chemical Engineering 1
- Inorganic Chemistry 1
- Measurement Science and Instrumentation 1
- Mechanical Engineering 1
- Physical Chemistry 1
- Polymer Sciences 1
- Sustainable Development 1