The document discusses different types of alternative fuel vehicles: - Electric cars, which use batteries charged by plugging into the electrical grid, have no emissions but long charging times. Solar powered cars could charge from the sun but are not yet practical. - Natural gas cars can use compressed natural gas instead of gasoline, reducing emissions but requiring new fueling infrastructure that is not widely available. - Hybrid cars combine a gas engine with electric motors and batteries to improve fuel efficiency, but are currently more expensive than regular cars. - The Toyota Prius is a popular hybrid model, and a future version may achieve over 100 miles per gallon. Solar powered and electric vehicles may be more practical future options as technology advances.

1. Cars of the Future Elizabeth Miller