By focusing on individuals as the target of analysis and interventions, psychology tends to individualise the problem and potential solutions. Psychology’s narrow focus characterises the individual (and groups of individuals) as the sole agent of change, remaining agnostic to the larger systemic and structural entities that are primarily responsible for climate change (and mitigation approaches). The IPCC has acknowledged that individual behaviour change alone will not be enough, instead calling for transformations to our systems to enable the required emissions reductions. In this chapter, we ask, in response to the urgency and scale of the climate crisis, how can environmental psychologists engage with system-level processes? Firstly, we argue that environmental psychology can serve a descriptive role. It can provide a lens to understand how psychological drivers of behaviour may be embedded in broader societal forces. And, liaise with neighbouring disciplines to study perceptions of transformative system-level agendas. For example, while much research on degrowth comes out of ecological economics, more work is needed to understand psychological processes inhibiting support for the agenda. Secondly, we underscore psychology’s role in investigating ways to achieve environmentally-impactful transformations. Psychologists can endorse direct and democratic means of transforming our system by focussing on policy support as outcome measures. Behaviours and values may still be relevant, but research should focus on those that enable transformation, such as sufficiency. To further promote democratic deliberation, research methods could facilitate conversations via deliberative methods, for example via citizen’s assemblies, rather than extracting information. Deconstructing differences in feasibility and access across contexts, psychologists can identify diverse ways in which individuals act to demand social and climate justice and further empower such collective endeavours. Given the complexity of the global climate crisis, psychology must expand its focus beyond the individual to the system in order to create meaningful impact.