Transportation | 3 | |
Economic Impact | 2 | |
Cultural Impact | 1 | |
Energy | 1 | |
Food Security | 1 | |
Human Health | 1 | |
Buildings | 1 | |
Sanitation | 1 |
3 | 1 | 1 |
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3 | 1 | 1 |
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United States | 4 | |
Canada | 1 |