Classification
UMV - Climatic change
27
UED - Environmental policy
17
GRBN - Climatological models
1
GWA - Raw material economy, raw material policy
1
UEDM - Policy of clean air
1
UEN - Environmental economy
1
UENH - Cost factors of air pollution and control
1
UKA - Environmental damage and energy production
1
UMD - Atmospheric models
1