Synopsis The charter of UN makes possible a maturing elaboration of the crucial idea of sustainable development, but it has been left to us in the last decades of the twentieth century to try to bring the concept of development of fulfillment. In the light of the new vision of development that is emerging, an alternative to the UN in development simply does not exist. The UN is a forum where the voice of all States, great and small, can be heard with equal clarity, and where non-State actors can make their views known to the widest audiences there is still time to move forward together, but greater urgency is necessary. The present work seeks to revitalize the vision of sustainable development and stimulate an intensified discussion of all its aspects.