The Earth is not simply the terrestrial globe (earth), it is also and fundamentally the habitable world (Earth). Now this Earth is in a critical state. Overexploited, despoiled, her finitude is denied by the productivist appropriation which dominates our times and which increases inequalities within societies and between different parts of the world. By continuously destroying the Earth, mankind is destroying itself. It has become urgent for us to change, if humanity wishes to remain (at least partly) free to make its own destiny and pass on a habitable world to future generations. Many things have been said and written on other possible developments, but what has been missing is a principle which could give an account of the philosophical shift we need to make. Such is the purpose of Inappropriability of the Earth, which aims to rethink our being in its relation to others, to humanity and the living world through the concept of inappropriability.