Shared efficiency. The fundamental advantage of a bus is simple maths: one engine moves 40–57 people. A plane might carry more passengers in total, but the fuel burned per seat-kilometre is vastly higher due to the energy required for flight.
No altitude emissions. Aircraft release CO2, nitrogen oxides and water vapour at high altitude, where their warming effect is 2–4 times greater than the same emissions at ground level. This “radiative forcing” multiplier is not captured in simple CO2 comparisons but is critical to the true climate impact of flying.
Modern diesel and alternative fuels. Euro VI coaches are already among the cleanest diesel vehicles on the road. The industry is rapidly transitioning to biodiesel, CNG and fully electric coaches, which will push bus emissions even lower in coming years.
Door-to-door means fewer transfers. A bus picks you up at your hotel and drops you at your destination. No taxi to the airport, no shuttle to the terminal, no rental car at the other end. Those “last mile” trips add significant hidden emissions to air travel.
