To help mainstream 1.5° lifestyles, the EU 1.5° Lifestyles project connects an analysis of individual lifestyle perspectives with an investigation of structural influences on lifestyle choices and impacts. On that basis, it develops recommendations and tools for political decision-makers, households and intermediary actors. It targets the problem that prevalent behaviour-based approaches tend to make individual consumers responsible for addressing the climate crisis, while neglecting the effects of political-economic, societal and technological structures. Against this background, the project quantifies lifestyle options and identifies necessary changes in relevant structures to enable impactful lifestyle changes.