The book is a great piece of work, putting together four of the most important things that we should be concerned with, as we look to the future of our species on this planet, i.e., food, water, energy, and the environment. The two divergent approaches to each of these four areas are presented about as objectively as I think is possible, without taking sides. There are certainly arguments for both the Wizards' as well as the Prophets' perspectives. It is important that people have a clear understanding of the issues involved and not form half-baked opinions. Towards that end this book does a great service, as it it lucidly brings out the most complex scientific arguments and concerns and presents them in layman terms. I have finished reading about 350 pages and hope to complete the rest of the book in the next few days.I am sure I will reread the book several times and keep it as a handy reference.