Question

which is the most effective action for people to take in order to reduce greenhouse gas emissions?
○ taking the bus more often
○ using a car powered by fuel cells
○ driving a car only five days a week
○ using a car that travels farther on each gallon of gas

Explanation:

• Taking the bus more often: While public transport reduces emissions per passenger, it still uses fossil fuels (in most cases) and doesn’t eliminate personal vehicle - related emissions entirely.
• Using a car powered by fuel cells: Fuel - cell cars (e.g., hydrogen - powered) produce electricity through a chemical reaction that emits only water vapor, significantly reducing or eliminating greenhouse gas emissions from the vehicle's operation.
• Driving a car only five days a week: This still involves using a conventional (likely fossil - fuel - powered) car for the days driven, so emissions are only reduced marginally.
• Using a car that travels farther on each gallon of gas: This improves fuel efficiency, but the car still burns fossil fuels and emits greenhouse gases, just at a lower rate per mile. So, using a fuel - cell car is the most effective as it can nearly eliminate direct greenhouse gas emissions from the vehicle.

Answer:

B. using a car powered by fuel cells