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Environmental aspects
Transportation
7
Automobiles
3
Business & Economics
3
Civil & Environmental Engineering
3
Engineering & Applied Sciences
3
Environmental Engineering
3
Transport
3
Transportation Economics
3
Urban transportation
3
Carbon dioxide
2
Carbon dioxide mitigation
2
Congresses
2
Environmental impact analysis
2
Environmental protection
2
Exhaust gas
2
Government policy
2
Greenhouse gas mitigation
2
Motors
2
Planning
2
Social aspects
2
Urban transportation policy
2
Waterways
2
Air
1
Air -- Pollution -- Law and legislation
1
Air -- Pollution -- Standards
1
Cities and towns
1
Commuters
1
Commuting
1
Costs
1
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