- Environmental Engineering/Biotechnology 68
- Renewable and Green Energy 68
- Biotechnology 49
- Microbiology 49
- Plant Breeding/Biotechnology 49
- Environment, general 13
- Ceramics, Glass, Composites, Natural Materials 10
- Fossil Fuels (incl. Carbon Capture) 10
- Engineering, general 9
- Industrial Pollution Prevention 9
- Waste Management/Waste Technology 9
- Agriculture 6
- Soil Science & Conservation 6