Transport and environment report 2020 - Train or plane?

Traveling by plane, train or automobile: the most environmentally sound choice may not always be clear. The report assesses the value of travel by train and plane. Rail travel is the best and most sensible mode of travel, apart from walking or cycling. Aviation’s emission impacts are much higher on a passenger-kilometre basis. But flying is not necessarily the most harmful choice. Travel by a petrol or diesel-powered car, especially if traveling alone, can be more harmful.