In this book, Jeffrey D Sachs stresses that the global economic system is faced with a sustainability crisis which will invalidate some of the basic assumptions of economics. The book explains that changes have to be made, which go deeper than merely re-balancing economics and politics. A common ground is required between the rich and the poor, among diverse ethnicity, and also between mankind and nature. A new economic model that is more global, inclusive, scientific and environmentally aware is necessary. If not, there will be a severe economic collapse world wide. He explains that the needs of the poor must be addressed and that threatened sources of water, air, land and energy must be conserved. The book outlines the corrective measures that must be implemented for the sake of our futures.