Part I - Money and its role in the economy -- 1. Introduction: the world is on a collision course -- 2. What is money? -- 3. Money is like the 'blood' of the economy -- Part II Money and the unsustainability in stricto sensu -- 4. The growth imperative inherent in our financial system -- 5. The effect of the money interest rate on money supply, demand and growth -- 6. Economic growth in the long run is unsustainable -- 7. Economic growth or unemployment -- Part III. Money and inequality -- 8. Our current monetary system produces income inequality -- 9. Moral-ethic aspects of interest-induced inequality -- Part IV Natural money as solution -- 10. Gesell's solution -- 11. Gesell's Solution to achieve the SDGs -- 12. How to implement Gesell's solution in today's world -- 13. Alternatives to Gesell's solution -- 14. Experiences with Gesell's solution -- Part V Outlook and final considerations -- 15. Towards a Development at Human Scale -- 16. Economic resilience in presence of externals shocks -- 17. Final considerations.