The literature of a society is considered a part of its written culture, which contains habits, customs and many elements of the important culture of the society and its problems, and even shows the ideal society of the writer or poet. The purpose of this research is to understand the traces of the green activist in the poem " Let's not muddy the water" by Sohrab Sepehri, one of the well-known poets of Iran. In examining the footprints of the "green activist", sustainable development, collective protection of the environment, the school of radical environmentalists, the theory of risky society and bio-ecology are mentioned. In this article, Sohrab's selected poetry is analyzed using the hermeneutic method, which means the art of interpretation. The research findings under the concepts of "green present and green future", "green devil; human artifact", "collective action liberation; green togetherness " and "earth's sameness; The same being of human being" is included. The results of the research show that Sohrab's poetry is a mirror of the whole view of sustainable development and attention to the future. This poem, while saying that all activists should defend the environment, notes the dark consequences that the activists themselves can create. In the storm of these black consequences, Sohrab is looking for a green activist, an activist from nature itself.