More and more people are thinking about upcoming catastrophe, we living in harsh times isn't it? However just before WW II due to some social survey people considered their environment stable and nobody preached of upcoming disaster. I didn't enjoy reading The Knowledge despite the catchy title, book isn't very exciting and I find it quite irritating that author persists on the point that after the catastrophe all the resources except for human will be available for some time, so if you want to get some food then go to grocery store, or if you want to change your location get a car from auto dealer.