Classification
UKE - Environment and energy resources
82
UKA - Environmental damage and energy production
15
EVA - Energy demand, energy supply - comprehensive works
10
ECA - Energy resources
6
EHA - Renewable energy sources
6
EEA - Coal - general
4
ENA - Energy from biomass and waste
4
UMV - Climatic change
4
CXA - Coal and fossil fuel - chemistry and technology
3
EBA - Energy production, energy technology
3
EXA - Energy policy
3
GFA - Mineralogy - general
3
UCL - Environmental research
3
UEF - Sustainability
3
UKH - Environment and power plants, industrial plants
3
EIA - Solar energy - general
2
EKA - Wind energy
2
ETC - Energy conversion
2
LWE - Agriculture - general aspects
2
LWO - Agricultural ecology, sustainable agriculture
2
TKF - Power plants
2
UED - Environmental policy
2
UEN - Environmental economy
2
UHC - Area planning and environment
2
UKB - Environmental effects and energy
2
UKL - Environment and nuclear power
2
UML - Air pollution by special sources
2
CHXP - Thermochemistry
1
CXG - Coal and fossil fuel refining and cleaning
1
CXK - Coal gasification
1
CXL - Coal liquefaction
1
CXR - Natural gas and petroleum - chemistry and technology
1
CXRU - Synthetic fuels
1
EFN - Petroleum exploration, natural gas exploration
1
EFP - Petroleum production, natural gas production
1
EIP - Photovoltaics
1
ELA - Geothermal energy
1
EVN - Energy supply - future aspects
1
EVP - Energy models, energy system analysis
1
GRB - Climatology
1
LTN - Biotechnology - biodegradation
1
UAD - Environment - comprehensive works
1
UCA - Environmental problems, man and environment - general aspects
1
UCQ - Environmental technology
1
UHN - Landscape ecology
1
UMGE - Carbon capture and storage (CCS)
1
UMN - Air pollution control and measurement
1
UVC - Environmental chemicals, hazardous materials - general aspects
1
YPM - National economy
1
YPO - Economic policy
1
more ...