How to question the thought of Sartre who embraced philosophy, the novel, the theater, the century and tied the conceptual adventure to political commitment? How to dust off Sartre's clichés? How are we heirs to the new way of philosophizing that he inspired, this new way of posing problems? In other words, how is Sartre our contemporary? This essay proposes to answer it through an original questioning, confronting the philosophy of Sartre centered on the opposition between man and the world with the thoughts of Spinoza, Nietzsche and Deleuze to consider the possibility of a policy resolutely turned towards a post-humanist ecology.