The establishment and growth of religion and ecology as a new area of study can be attributed in part to its instigation by scholars who feel morally and ethically compelled to address serious environmental problems. That religion itself has been implicated as a catalyst of environmental decline has prompted such scholars to examine the relationships among human cultures, religions, and environments. The Encyclopedia of Religion and Nature is, of course, one manifestation of the effort to understand such relationships. But it is hardly the first example of interest in religion and ecology among religious studies scholars, and some of this interest is more than analytic, it is itself religious. Indeed, especially since the mid 1960s, there has been intense scholarly interest in the relationships between human cultures, religions and environments, not only among religious studies scholars, but also among philosophers who have been pioneering the field of environmental ethics. Some anthropologists have also focused attention on ecology and religion and have been developing a field known as ecological anthropology. A good starting point for the study of religion and nature is to review the range of scholarly approaches to understanding the relationships between cultures, religions, and environments. In this essay, the author focuses on the role played by religious studies scholars in religion-related environmental studies and activism.