Most sustainability challenges are driven by human behaviour. Whether it's a consumer choice for sustainable products, citizen support for sustainable policy, or producer decisions to produce sustainable products or services, understanding human behaviour provides the key to addressing these challenges. At the Copernicus Institute of Sustainable Development, we study the human dimensions of sustainable transitions. Our research interests include perceptions of environmental problems, decision-making processes, acceptance and adoption of sustainable innovations, sustainable consumption, predictors of environmental behaviour, and designing behaviour change interventions. We follow an inter- and trans- disciplinary approach by involving citizens, companies, societal organizations and policy makers in our projects to ensure transformative impact of our research.