Because this book is a year old, and since it's based on lots of current facts and percentages, I desperately want an update. It discusses a breadth of topics for an energy transition away from fossil fuels and all of the current (or then current) plans for achieving this around the world. With some attention to improving energy efficiency, it primarily has sections on oil, coal (including a bit on natural gas), nuclear, solar, wind, geothermal, and hydro solutions. These seem fair in describing the benefits and disadvantages of each, but concentrate more on where the world stands and efforts to +/- each of these. While it's a small book, it's a good overview - that could have been helped with a few charts and graphs - but whose topics could have taken a full bookshelf. Still a very worthwhile read... especially for recognizing how much more our country could be doing now. ( )