<p>The challenge posed by the world’s current environmental crisis has elicited a response from mainstream world religions in the form of efforts to construct an environmental ethics, based on religious and spiritual values. Suggestions for protecting and conserving the environment are a very ancient and fundamental aspect of religious teaching. The author will explore the perspectives of a number of environmental thinkers, including Fachruddin Mangunjaya of Indonesia, Hossein Nasr as a representative of Sufism, and Fazlun Khalid of the United Kingdom. The paper draws on structured and unstructured interviews with these thinkers and on exploration of their published works on nature conservation. From these sources the author has realiz...