In this article, we will try to present the opinions of the Holy Prophet about the environment. The narratives which emphasize his teachings on environment have been ranked among classical hadith sources disorderly. According to the relevant narratives, it is possible to say that the Holy Prophet is the most remarkable eco-friendly in the human history. The Holy Prophet did some acts to save the ecological balance of nature throughout his life. The foremost ones of these acts were not to waste natural sources and keeping clean the environmental elements. He showed great importance to be protected environment as long as he was alive. In this respect, The Holy Prophet urges his companions to protect trees. Before battles, he always gave instruction to his soldiers not to cut down a tree and not to burn farms or gardens. In addition, he gave many advice and showed lots of practices leading us for understanding the development of contemporary urbanism. He took steps actively for a more liveable and green world. The Holy Prophet thought that contacting with nature friendly is a part of responsibility. All these practices done and demonstrated by the Holy Prophet are to be called ecological sunnah. Other hand, the idea of “the entrustment” has been a dominant instruction in the view of environment of the Prophet. Because The Prophet, who stressed that entrustment must never be betrayed among people, has approached environment as blessing of Allah. Furthermore, he is an eco-friendly prophet who has advocated that each living thing has right to live. Therefore, advice and attitude of the Prophet about environment are enough necessities to make him to be one of the most eminent environmentalist in our world.