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Today's most urgent problems are fundamentally global. They require nothing less than concerted, planetwide action if we are to secure a long-term future. But humanity's story has always been on a global scale, and this history deeply informs the present. In this book, Jeffrey D. Sachs, renowned economist and expert on sustainable development, turns to world history to shed light on how we can meet the challenges and opportunities of the twenty-first century. Sachs takes readers through a series of six distinct waves of technological and ideological change, starting with the very beginnings of our species and ending with reflections on present-day globalization. Along the way, he considers how the interplay of geography, technology, and institutions influenced the Neolithic revolution; the spread of land-based empires; the opening of sea routes from Europe to Asia and the Americas; and the industrial age.