Subject
Agriculture
2
Air
2
Coal
3
Commercial sector
6
Education
2
Electric power
1
Electricity
3
Emmissions
1
Energy
6
Energy consumption
3
Fisheries
2
Forests
2
Industry
4
Land management
1
Manufacturing
2
Mining
2
Petroleum
3
Prices
3
Recreation
2
Residential sector
4
Rural areas
2
Statistics
4
Sustainable development
2
Tourism
2
Transportation
4
Urban planning
2
Water
2
Wilderness areas
2
Wildlife
2