The most comfortable and environment-friendly way to travel Germany is without doubt by train: According to Deutsche Bahn all their long-distance trains (ICEs, ICs and the German-driven ECs) are powered by renewable energies, and all destinations listed below can be reached by these trains directly or (as in the case of Heidelberg) by urban trains from the next ICE hub.
ICE and IC trains usually come with a restaurant car offering a number of organic items on the menu so that you (as of March, 2019) can have both, organic salads, pasta dishes, tea, hot chocolate, bionade lemonade, and potato chips. The coffee is fairly traded, yet not organic. If you come with your own mug to buy hot drinks you will get a 20 cents off.
Lower Saxony (Niedersachsen)
2015-01-12 12:00:06 [The_Conscious_Traveller, Germany, Baden_Wurttemberg, Berlin, Bremen, Bavaria, Bayern, Hamburg, Lower_Saxony, Niedersachsen, Saxony, bio, eco] Link