Sed, "Clean Supper", who has only posted here a couple of times, is an Australian songwriter who fits your description. He is currently travelling around the UK, I believe, and slowly working his way back here while trying not to use the petrol guzzling monsters. He has written a lot of songs about the environment for our choir, the Solidarity Choir and our sister choir, Ecopella, a green choir. Maybe you could try sending him a PM.

Jenny