Determining whether driving is more eco-friendly than flying depends heavily on passenger load and distance. In 2026, a solo driver in a standard gasoline car often has a higher carbon footprint per mile than a passenger on a full, modern commercial flight. However, a car with three or more passengers is statistically more efficient than flying for short-to-medium distances. Aviation remains the second biggest source of transport emissions (after road transport) and is harder to "green" due to high-altitude non-CO2 effects like contrails. If you are driving an Electric Vehicle (EV) charged with renewable energy, driving is vastly more eco-friendly regardless of the passenger count. For most long-haul routes, flying remains the dominant polluter per hour spent traveling.