Classification
ENA - Energy from biomass and waste
60
EHA - Renewable energy sources
11
LTN - Biotechnology - biodegradation
5
CXA - Coal and fossil fuel - chemistry and technology
3
EBA - Energy production, energy technology
3
LEL - Botany - lower plants
3
LWE - Agriculture - general aspects
3
UKE - Environment and energy resources
3
CHXP - Thermochemistry
2
CXR - Natural gas and petroleum - chemistry and technology
2
ECA - Energy resources
2
EIA - Solar energy - general
2
EKA - Wind energy
2
ETF - Fuel cells - general
2
UMGE - Carbon capture and storage (CCS)
2
CAV - Chemicals, chemical reagents
1
CLM - Catalytic processes
1
CNW - Electrochemical energy production and conversion
1
CWK - Chemical reaction engineering and reactor design
1
CXRU - Synthetic fuels
1
CXUK - Organic products
1
CXUX - Natural products
1
EEA - Coal - general
1
EIP - Photovoltaics
1
EIS - Solar cells
1
ELA - Geothermal energy
1
EMA - Hydroelectric, tidal energy
1
ESB - Hydrogen energy
1
ETA - Energy storage
1
EUD - Energy consumption
1
EVN - Energy supply - future aspects
1
LEO - Chemical compounds from plants
1
LKU - Biochemistry of specific compounds
1
LTH - Biotechnology - methods
1
LTX - Bioeconomy
1
UHCH - Urban areas
1
UKA - Environmental damage and energy production
1
UMV - Climatic change
1