NATURE CLIMATE CHANGE | VOL 5 | JULY 2015 | www.nature.com/natureclimatechange G lobal climate change is one of the major threats facing humanity. Human interactions with climate occur at all levels of social organization 1 , but so far research has focused largely on institutional actors (for example, governments, industries) and on the technological, demographic and economic trends that drive climate change. Factors that influence decisions and behaviour at the individual level have received significantly less attention 2 . However, individual behaviour is important 3 and ultimately drives societal change via adoption of technologies and support for policies. Unless we examine how people perceive climate change, what factors influence mitigation and adaptation behaviours and how climate change will affect human well-being, we will be unable to respond effectively as a society. Too much policy is based on oversimplifications and erroneous assumptions about these factors, for example, the assumption that informing individuals about climate change science is sufficient to affect decisions and behaviours 4-6 . Ignoring insights from psychological research can handicap progress towards a low-carbon, sustainable future 7,8 .Here, we review the unique contribution that a psychological approach 9,10 can provide for understanding and addressing climate change, complementing work from other disciplines. Psychological research employs rigorous empirical methods to investigate individual perceptions and cognitions, individual and collective behaviours, and psychological well-being related to climate change. This research incorporates physiological, cognitive, affective and interpersonal processes, as well as factors in the social, cultural, biophysical and engineered environments of individuals 5,11 . Some of the resulting insights are surprising or counterintuitive; in other instances, they serve as a reminder to consider factors that may be overlooked. Here we focus on three key areas in which psychological research contributes to the climate change literature: (1) public perceptions of climate change; (2) human behavioural drivers of climate change and mitigation responses; and (3) impacts of climate change on human well-being and adaptation responses ( Fig. 1). In each case, we review existing research and recommend key directions for future research. We conclude by considering the ways that psychologists can contribute to multi-and interdisciplinary teams to understand and inform climate change mitigation and adaptation.Human behaviour is integral not only to causing global climate change but also to responding and adapting to it. Here, we argue that psychological research should inform efforts to address climate change, to avoid misunderstandings about human behaviour and motivations that can lead to ineffective or misguided policies. We review three key research areas: describing human perceptions of climate change; understanding and changing individual and household behaviour that drives climate change; and examini...