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The personal assessments of the current and expected future state of the environment by 3232 community respondents in 18 nations were investigated at the local, national, and global spatial levels. These assessments were compared to a ranking of each country’s environmental quality by an expert panel. Temporal pessimism (“things will get worse”) was found in the assessments at all three spatial levels. Spatial optimism bias (“things are better here than there”) was found in the assessments of current environmental conditions in 15 of 18 countries, but not in the assessments of the future. All countries except one exhibited temporal pessimism, but significant differences between them were common. Evaluations of current environmental conditions also differed by country. Citizens’ assessments of current conditions, and the degree of comparative optimism, were strongly correlated with the expert panel’s assessments of national environmental quality. Aside from the value of understanding global trends in environmental assessments, the results have important implications for environmental policy and risk management strategies

This overview describes the anthropogenic drivers of global climate change, reviews the behavioral and psychological responses to its impacts (including barriers to behavior change), considers behavior-focused intervention strategies, and suggests future directions for research. In doing so, it demonstrates why and how behavioral science is crucial for confronting the complex challenges posed by global climate change. The human dimensions of climate change are discussed, followed by descriptions of key theoretical models for explaining and predicting climate-relevant behavior, issues and distinctions in studying human behavior in response to global climate change, an account of psychological (as opposed to structural) adaptation and its behavioral sequelae, the many psychological barriers to behavior change in this context, and behavior-focused intervention strategies. The overview concludes with suggestions for researchers interested in advancing knowledge about behavior change and psychological responses to climate change. When knowledge about human behavior, cognitions, and psychological adaptation is integrated with that produced by researchers in related social and natural science disciplines, the result will facilitate solutions to this massive shared challenge. 

A month-long field experiment evaluated the impact of descriptive social norm information on self-reported reduction of private vehicle use. Following a baseline week, participants were asked to reduce their vehicle use by 25% and were randomly assigned to a control condition or to a low or high social norm condition in which they received information that either under- or over-reported others’ successful efforts to switch to sustainable transportation. Results indicated a significant linear trend, such that messages highlighting more prevalent descriptive social norms increased sustainable transportation behavior (relative to private vehicle use) for commuting, but not non-commuting, purposes. Participants in the high social norm condition decreased their commuting-related private vehicle use by approximately five times, compared with baseline. Car-use message campaigns can reduce private vehicle use by highlighting descriptive norms about others’ sustainable transportation efforts, but these messages appear to be most effective for commuting behavior.

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