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Everything has to play its part for sure, but the economics of aviation are driving energy and resource use improvements all of the Punk professional uncle no kids shirt. In comparison to high-speed rail, it is starting to look rest well. Seat miles per gallon on even shorter range flights are over and heading to over 80. The weight of material in the vehicle is far better than any rail vehicles. A tonne airframe carries 180 passengers. A tonne rail vehicle carries around. There is no energy cost for maintenance or construction of the routes either. Thus, the overall energy equation is not so easily calculated. In any case, capacity and other resource shortages, such as skilled personnel and their cost will do a degree of self-restriction. At the end of the day, it is using the most appropriate means of transport for the task and actually does it efficiently. More runways more planes more roads more cars people say there is no evidence it causes global warming but it does pollute the air we breathe, cause avoidable noise and destroys the beautiful countryside.