33Environmental Engineering29Renewable Energy, Sustainability and the Environment26Waste Management and Disposal24Pollution23Environmental Chemistry19Bioengineering19Water Science and Technology17Biotechnology17Environmental Science (all)17Fuel Technology17Medicine (all)16Energy Engineering and Power Technology14Management, Monitoring, Policy and Law12Condensed Matter Physics11Chemical Engineering (all)11Chemistry (all)9Atmospheric Science9Global and Planetary Change9Process Chemistry and Technology8Chemical Health and Safety8Safety, Risk, Reliability and Quality7Applied Microbiology and Biotechnology7Ecological Modeling6Engineering (all)6Ocean Engineering5Artificial Intelligence5Biochemistry5Geotechnical Engineering and Engineering Geology5Health, Toxicology and Mutagenesis5Industrial and Manufacturing Engineering5Microbiology4Public Health, Environmental and Occupational Health3Agronomy and Crop Science3Catalysis3Computer Science Applications3Control and Optimization3Filtration and Separation3Forestry3Geochemistry and Petrology3Hardware and Architecture3Materials Chemistry3Mechanics of Materials3Nuclear Energy and Engineering2Analytical Chemistry2Civil and Structural Engineering2Computer Networks and Communications2Decision Sciences (miscellaneous)2Economics and Econometrics2Energy (miscellaneous)2Engineering (miscellaneous)2Environmental Science (miscellaneous)2Food Science2Information Systems and Management2Metals and Alloys2Multidisciplinary2Physical and Theoretical Chemistry1Applied Mathematics1Biomaterials1Biomedical Engineering1Biophysics1Business, Management and Accounting (all)1Computational Mechanics1Computer Vision and Pattern Recognition1Control and Systems Engineering1Earth-Surface Processes1Electrical and Electronic Engineering1Electrochemistry1Geography, Planning and Development1Geology1Human-Computer Interaction1Information Systems1Inorganic Chemistry1Materials Science (all)1Materials Science (miscellaneous)1Mechanical Engineering1Molecular Biology1Neuroscience (all)1Organic Chemistry1Software1Soil Science
