Comment by lispm

German here. I have a Bahncard 100, which allows me unlimited train travel (plus unlimited local public transport in many cities) in Germany with most trains for one year. Fast or slow. I don't care. I usually pick the faster one.

http://www.bahn.de/i/view/DEU/en/prices/germany/bahncard.sht...

Deutsche Bahn also advertizes that they use renewable energy for my Bahncard travel and they will expand this over the coming decades to 100%.