This is a great book about preparing for short-term societal or environmental crises - how to conserve water when the water's not running (after a hurricane, say), how to stay warm and safe when the ice-storm of the century wipes out your natural gas and electricity, or an earthquake shakes your house down around your ears in the middle of the night.
The true beauty of this book is the wealth of information for longer-term "doing without," or slow erosion of a situation of plenty we now take for granted. Here is information on dealing with medical problems when no doctor is forthcoming, growing food organically and with your own saved seed, how you might store food over the winter with no refrigerator.
If we lost the luxury of the machines that run our world, would we find ourselves back in the stone age, having lost the knowledge handed down for generations beyond count of how to shelter, clothe, feed and doctor ourselves? These skills are all touched on in this book, with voluminous resource lists so that the reader can learn more about any of these subjects.
Technology, too, is given its due - renewable energy sources like solar and wind are discussed and the best water filters on the market.
Change is coming. That's apparent. If you're worried, wary - this is a good book, a jumping-off place to learn skills you may some day be very thankful for, or at least gather a library of relevant information against the day when it is needed. Survivalist paranoia not required.