Climate change is arguably the biggest and most complex problem society faces, and it is driven by human behaviour, landing it squarely in the realm of applied psychology. Traditional applied psychology approaches (e.g. the Reasoned Action Approach; Fishbein & Ajzen 2010) take an agent-centric view of human behaviour - regarding it as the outcome of rational, linear, cognitive processes. These downplay the role of concrete context in behaviour (change). On the other hand, structural approaches, typically grounded in sociology or philosophy (e.g. Social Practice Theory; Shove et al., 2012), view behaviour as emergent from, and a product of, its environment. This can be to the extent of dismissing the role of the agent altogether. In the context of carbon-relevant household behaviour, these approaches each have unique strengths that compensate for the others' weaknesses. However, they have previously been argued to be incommensurable and have thus remained siloed within their respective disciplines. The present research has found that these approaches are indeed both conceptually and theoretically commensurate. It highlights the value of a multi-lens perspective on climate change, and calls for a coordinated, interdisciplinary approach to our biggest problems as a society.