Introduction -- The Nexus of Energy, Carbon and Water ; The Challenge of the World Energy Supply ; Nuclear Energy ; The Era of Fossil Fuels ; The Greenhouse Effect and Global Warming ; How to Stop Climate Change? ; The Carbon Cycle in a Sustainable Future ; Reversing Climate Change ; Water, the Elixir of Life ; Fossil Water and Desertification ; Technical Options of Fresh Water Supply ; The Water Cycle in a Sustainable Future ; Reversing Desertification and Soil Degeneration ; Conclusions -- Energy in Times After the Energy Transition. Overview of the Future Energy System ; Energy Production : Locally or at Best Sites? ; Technologies for Renewable Energy Production ; Entropy, Exergy, and Why Energy Cannot Be Produced ; Electrification of Mobility and Heat ; Energy Sharing : The Smart Grid ; Energy Transport : Reducing Local Volatility ; The Overlay Network : AC or DC? ; Gas or Electricity? ; The Dual Storage Concept ; Overview of Energy Storage Technologies ; A New Chance for DESERTEC ; Conclusions -- Political Implications. One World ; Capitalism in a Global Market ; Paradigm Change in Energy Economy ; The Global Union ; Conclusions -- Closing Remarks.