Certainly, there are many possible solutions to reduce greenhouse gas emissions from transportation, but the following are five feasible methods that are often considered:

1. **Electrification of Vehicles**: Transitioning to electric vehicles (EVs) can significantly reduce emissions. EVs are far more efficient than internal combustion engine vehicles and, if charged from a clean electricity grid, they produce zero tailpipe emissions.

2. **Public Transit and Non-Motorized Transport**: Investing in public transportation, biking, and walking can provide alternatives to private car use, thereby reducing emissions. Improved public transit can be more efficient and have a lower carbon footprint per passenger mile compared to private vehicles.

3. **Vehicle Efficiency**: Increasing fuel efficiency in cars and trucks can have a significant impact on reducing emissions. This can be achieved through advancements in technology as well as through regulations and standards set by governments.

4. **Sustainable Biofuels**: While not completely carbon-free, sustainable biofuels can have a lower carbon footprint than conventional fossil fuels and can be used with existing infrastructure and vehicle technologies. However, the sustainability of biofuels depends on how they are produced.

5. **Behavior Change**: Encouraging changes in transportation behaviors can also make a big difference. This can include promoting carpooling, reducing unnecessary travel, and supporting remote work.

These solutions require a mix of technological innovation, policy measures, and behavior change to effectively reduce greenhouse gas emissions from transportation.
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