This article first briefly reviews some theoretical perspectives that have been applied to environmental behavior. Next, a theoretical model is proposed to help organize the broad range of research findings. The effects of specific variables in this model on psychological and behavioral outcomes are then discussed. Research indicates that environmental messages need to be framed in the context of the characteristics, values, and loyalties of the audience, as well as in the context of their interests. Programs to combat climate change should be structured so that individuals see their actions as part of a shared social effort.Since climate change has become a topic of public discussion in the last few decades, many studies have examined a wide range of influences on climaterelevant behavior (for extensive reviews of this work, see Moser & Dilling, 2007a). These studies are very useful in helping to build a knowledge base. However, as Bamberg and Schmidt (2003) note with respect to the broader literature on environmental behavior, "often it remained unclear how these [determinants] relate to each other." They note the desirability of using theoretical frameworks to organize and relate specific research findings.In this article, I first briefly review some theoretical perspectives that have been applied to environmental behavior. Next, I propose a theoretical model that is intended to help organize the broad range of research findings. The main portion of the article then discusses the effects of specific variables in this model on psychological and behavioral outcomes. 1