Sustainability is a category that transcends political regimes. It permeates the dimensions of humanity's sociability, impregnating our minds and praxis with environmental issues and global socio-economic inequalities. It mobilises parliaments, the market and educational and research institutions. It proposes new regulatory systems for relations between peoples and public policies, causing changes in production matrices, technical professions and ways of organising humanity. It recognises diversities and differences from a perspective that integrates cultures towards societies of knowledge. In this book, Marcílio presents a set of fruitful alternatives that sustainability poses to people, public and private institutions and humanity for building a world with more solidarity and commitment to our future. It emphasises the operational mechanisms needed to re-signify the concepts of citizenship and economic development from a perspective that values the human condition and social promotion. This is an original, thought-provoking and surprising book.