Water is critical around the world.
I am somewhat skeptical about the 70 percent figure in the United States, anyway, where we have built huge cities in the desert which are growing fast. Also monolithic agriculture where we grow thousands of acres of one thing makes it hard to really know your land and all the microclimates on your land, some of which are wetter than others, so you just have to soak it all. He starts by talking about the Green Revolution and how it averted or severely reduced an anticipated worldwide hunger crisis. That is a great question. I tend to think that individual farmers feeding themselves and their communities is the model, but I am really only talking about the United States since that is all I know.