Jesse Prinz and Shaun Nichols have argued that within metaethics, sentimentalism is the theory that best accords with empirical facts about human moral psychology. Recent findings in experimental moral psychology, they argue, indicate that emotions are psychologically central to our moral concepts. One way of testing the empirical adequacy of sentimentalism is by looking at research on environmental values. A classic problem in environmental ethics is providing an account of the intrinsic value of nonhuman entities, which is often thought to be inconsistent with sentimentalism. However, no supporters of sentimentalist accounts of environmental values have evaluated the empirical adequacy of their claims. The relevant evidence falls under two broad categories: (1) responses to nature itself and (2) moral evaluations of environmental behaviors. The evidence indicates that both valuing and disvaluing nature are ultimately grounded in emotions.