ABSTRACT :The urgency of the ecological crisis popularized since 1970 has been the occasion of a growing interest in ontology. With the Norwegian philosopher Arne Næss, ontology will benefit from an epistemological argumentation which constitutes the very crucible of his thought. From his point of view, ontology occupies a central place in the resolution of the climatic phenomenon, since the destruction of nature that we are experiencing in this century is the result of the deformation of our perception of the world and of ourselves in her bosom. Hence an ontology defect. However, the place constitutes a dimension of the human. This article questions the relevance of a thickness of the ontology of the local.