Which mode of transport is most damaging to the environment?

Air travel is often considered the most damaging mode of transport to the environment due to its high carbon emissions per passenger mile. Commercial airplanes contribute significantly to greenhouse gas emissions, particularly at high altitudes, where their impact is amplified. Additionally, the production and maintenance of aircraft, along with the infrastructure required for airports, further exacerbate their environmental footprint. While other forms of transport, like cars and ships, also have significant impacts, air travel stands out for its efficiency in terms of emissions relative to distance traveled.