Steiner (pictured) claimed direct experience of the 'spiritual' world. He was a philosopher, occultist, social reformer, architect, esotericist. and founded Anthroposophy. Anthoposophy claims to investigate the spiritual world and believes it can attain precise and clear conclusions in the same way that science concludes about the physical world.
I've been an active green for 30 yrs and I teach environmental sciences (which is simply the proper application of scientific methods to the environment). I do not support Steiner's ideas or Steiner Free Schools and would point to the British Humanist Association concerns about them (see http://www.humanism.org.uk/news/view/1042 ).
Background on Steiner:
http://www.rudolfsteinerweb.com/ and http://en.wikipedia.org/wiki/Rudolf_Steiner