FLAC or ALAC files are most environment friendly, bringing raw quality at a half of a weight! ))
Serious, man, our demonic culture has nothing to do with a healthy being. Still killing animals to eat? Still pumping oil to drive fast? It will not last long, but nothing apocalyptical too.
The best and environment friendly music is live acoustic music, like good old folk, blues, jazz, gospel, bhajan, etc. All other things are just temporary filthy toys. Saying that, i'm still making electronic music, but at least i have a guitar and accordeon to play real )
Want to be environmental conscious? Stop eating animals firstly.
Where the supreme pleasure which is beyond senses is perceived through intelligence, having established himself there, he no longer wavers away from the Lord.
Gaining which he considers no other gain to be superior to that and abiding therein, he is not shaken even by the greatest of the sorrow.