The document discusses and compares different alternative fuel vehicles: ethanol cars, solar cars, and hybrid cars. It provides pros and cons for each type of vehicle. Ethanol cars can run on ethanol made from plants and are better for the environment, but ethanol production may increase food prices and require more land clearing. Solar cars produce no emissions but are dependent on sunlight and have no power for amenities. Hybrid cars have better gas mileage and fuel efficiency than conventional cars but may have slightly lower actual mileage and higher upfront costs.