[Review of Kindle version] Big World, Small Planet is clearly written, well argued and - as the initial reviewer indicated - optimistic. If you have a choice, I recommend the hard cover version over the Kindle tablet version (e.g. Voyager). The images in Big World, Small Planet are an important part of the argument. Kindle's black and white photos do not do justice to Klum's photography. (A significant caveat: the kindle computer and iPad app do show the photographs in color.) As Rockstrom explains in the preface "a deep mindshift was required for genuine change, and that could not be reached through numbers alone. It had to come from both the heart and the brain." Big World, Small Planet offers a post-nation state prescription for acting on a threat more consequential than cyber, ISIS, proliferation, pandemics - pick your fear.