Two more articles I just came across and thought are definitely worth a read:

Mythology of the Green Man, an excerpt from "The Mythic Forest, the Green Man & the Spirit of Nature"--an interesting scholarly paper written by Gary Varner,  http://www.authorsden.com/visit/viewArticle.asp?id=13535

"The Green Fingerprint"--another well-done academic treatise on the ecological crisis, consciousness, creativity, mythology, alchemy, & Jungian concepts, written by David Catherine :http://khidr.org/Green_Fingerprint.pdf