<![CDATA[The global environmental crisis demonstrates that ecological problems are not merely technical in nature, but also related to the crisis of human perspectives on the environment, which tend to be anthropocentric and secular. This has led to the desacralization of nature and encouraged the overexploitation of resources. In this context, Seyyed Hossein Nasr's thoughts in the book Man and Nature are important to examine as an alternative in understanding the relationship between humans and nature holistically. This study aims to answer three research questions: the background to the writing of Man and Nature, the principles of environmental ethics in Nasr's thoughts, and the implications of these thoughts in discourse and action regarding the contemporary ecological crisis. This study is a qualitative study with a library research type using a philosophical and hermeneutic approach. Data were obtained from Nasr's work Man and Nature: The Spiritual Crisis of Modern Man as well as from books, journals, and related literature. The data collection technique was carried out through a literature study using content analysis using an analytical-descriptive approach. The results of the study show that: (1) the background to the writing of Man and Nature is rooted in criticism of modernity which has eliminated the spiritual dimension in understanding nature, thus giving rise to an ecological crisis as a reflection of human spiritual crisis, (2) the principles of environmental ethics in Nasr's thinking include the sanctity of nature, the unity of the cosmos based on monotheism, human responsibility as caliph, ecological balance, and the prohibition of destroying nature, which is strengthened by the concept of resacralization of nature and scientia sacra, (3) Seyyed Hossein Nasr's thinking has implications in the discourse of environmental ethics through collaboration between science, religion, and spiritual values and at the level of action through changes in human perception and actions towards the environment towards a more responsible and sustainable attitude.]]>
