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| Transportation CO2 Equivalency Values | ||
| Transportation Process | Unit | Lbs. of CO2 |
| Van 3.5 ton | / ton mile | 0.19 |
| Truck 16 ton | / ton mile | 0.16 |
| Truck 28 ton | / ton mile | 0.12 |
| Truck 40 ton | / ton mile | 0.11 |
| Automobile, 20 mpg | / ton mile | 0.24 |
| Automobile, 50 mpg | / ton mile | 0.094 |
| Ship, oceanic freight | / ton mile | 0.015 |
| Train, freight | / ton mile | 0.02 |
| Air, freight, regional | / ton mile | 2.8 |
| Air, freight, intercontinental | / ton mile | 1.6 |
| Source: Okala: learning ecological design, page 53. | ||
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