Train, plane and bus tickets should show carbon footprint

Good idea - how else can we know the impact we are causing. The Guardian reported

"Plane and train tickets should reveal the environmental impact of individual journeys by stating the carbon emissions released on each trip, the UK's main professional body for engineers said yesterday.
The Institute of Mechanical Engineers said branding tickets according to their green credentials should be one of a series of measures the government should adopt, so that having a large carbon footprint became "as socially unacceptable as drink-driving".
In a report on sustainable transport, the body highlighted trains as one of the most environmentally benign ways to travel and put forward strategies to wean people away from travelling by car or plane, including extra fuel taxes, congestion charges and more aggressive road pricing.
For a 400-mile trip from London to Glasgow, the carbon dioxide emissions per passenger travelling by road are 80.2kg, compared with 133.7kg by air and 46.8kg by rail, the report said."

For further details see the IME