I have spent my whole life in ecology, in many forms, including politics. And one of the most complex challenges I have faced has been the semantics of the concepts framing (or born from) this discipline, which is now becoming crucial in our planetary context. I will cite, for example, the difficulties in characterizing the difference between the concepts of eco-development and sustainable development, which, however subtle and fundamental it may be, is not at all specified in the articles devoted to them. Another example, just as crucial, will be that of the difference (or complementarity!) existing between the concepts of biosphere and ecosphere, which are often confused, to the point of generating a semantic vagueness which has not been clarified, while this difference alone is of crucial importance for the sciences, current and future, likely to accompany us in the major changes brought about, in particular, by the ecological transition. This is one of the reasons why I started, at the end of my career, a doctoral thesis in which I gave myself, among other objectives, to clarify these notions, and many others with them, objective successfully achieved according to my (international) thesis jury. My greatest wish today is to make the most of it for the population, French and international, for which Wikipedia seems to me the most appropriate medium. Is not it ?