In this book, the author analyzes and updates the Responsibility Principle of Hans Jonas. From the outset, the author asks the question of how it is possible to build a better future for future generations while respecting nature in the present, and what is man's responsibility in the face of the degradation of biodiversity and social life? First of all, the author shows that contemporary man, whom Hans Jonas qualifies as an unleashed Prometheus, through technology, rises as a dominating and colonizing master of nature. He, who is homo sapiens, no longer knows how to impose his reason on the homo faber who manipulates everything and who even makes man an object of technology. Then, he explains the Jonasian conception of responsibility that he considers as a novelty in morality and as a way that can lead to the salvation of the planet and of future generations. He invites man to overcome the utopia of technology through responsibility. Finally, he shows how man, in his physicality, must recognize himself as a part of a Whole in which all parts are linked.