The German railway company Deutsche Bahn has released a beautiful educational video that explains the benefits of an environmentally conscious behaviour. In particular, the video suggests that travelling by train produces less CO2 than travelling by car or by plane. In addition, for every view of the video, which you can watch below, Deutsche Bahn promises to donate 10 cents to the "Bergwald Project," which has worked over 20 years for the protection and preservation of forest ecosystems in central Europe.
However, I am not sure how they are measuring this, as the movie is essentially non-embeddable. More details about their sustainability program can be found here [dbecoprogram.com].