This video is a little long but I really enjoyed it. It's a scientist explaining Gaia the ancient Greek deity of the earth. Check it out if you have some time. I think it pertains to permaculture because in it, Stephen Harding explains the connection between biotic and abiotic. Remember a main principle of Permaculture is "integrate rather than separate."
Check out more of these great educational video's at http://www.chelseagreen.com/tv