OK, I feel this is a major category that I have left out. Richard and Gregory may like it along with many others. I know Richard Nelson started a Food2Waste2Food program in Norway some years ago. I got a PhD in Chemistry but I cannot accept the way how we treat waste with chemicals! The nature does things quite differently and does it really well. No chemicals. No burning garbage with fire.
Recently I learned from Gregory Walker about the Black Dragon Flies, they can turn waste into food for worms and then to good organic nutrients for the plant. Today I learned from David Derbowka in Okanagon (50 miles away from me) that he uses trees and biochar to treat waste water near garbage dump site - very interesting. I would like to see more people talk about the NATURAL way to do things.