Social scientists have long debated the factors influencing public concern for the natural environment. This study attempts to contribute to this debate by arguing that environmental concern is shaped by both "spiritual" and "ecological" cultural models of nature-society relations and that by distinguishing between these two, we can better recognize the social sources of variation in concern for the environment. An analysis of questionnaire data from 21 nations from the 1993 International Social Survey Program using ordinary least squares regression models shows that spiritual and ecological environmental worldviews have different social bases. Education generally positively predicts the latter but not the former. Patterns of national differences are noteworthy as well. Thus, conceptualizing public concern for the environment in terms of distinct cultural models may be more revealing than focusing on environmental concern as such. (Contains 5 tables and 1 note.)