The global challenge of the green transition, aimed at achieving net-zero emissions, is expected to reshape the labour market significantly, impacting industries, consumption patterns, and energy provision worldwide. This shift is likely to create new jobs while rendering many existing ones obsolete, presenting both economic and redistributive consequences. There is increasing concern about the lack of skilled workers hindering this transition, particularly affecting young people entering the job market. Governments are increasingly acknowledging these challenges and enhancing efforts to prepare for labour market transformations within environmental policies. Education plays a crucial role in preparing students for future careers, not only through academic training but also by fostering the necessary knowledge, skills, attitudes, and values to meet upcoming challenges. However, there is a gap in how well schools are preparing students for careers in building sustainable societies, particularly in signalling green job opportunities. To address this gap, career guidance systems are essential, serving as bridges between students' interests and labour market demands. This scoping study examined 87 guidance programmes within primary and secondary education across 20 OECD countries, aimed at enhancing students' understanding of and progression towards green careers. While the programmes represent only a portion of initiatives in this field, they provide valuable insights into the conceptualisation and implementation of green guidance programmes, which are expected to become increasingly important in the future.