Climate change is impacting every aspect of life around the world and posing a growing threat to people and their livelihoods. It is critical to equip learners with the knowledge, skills, attitudes and behaviours to effectively address the climate crisis. Globally, there remain significant gaps in how climate change education and sustainability are taught in classrooms. Getting every learner climate-ready requires a holistic approach that involves adapting curricula, training teachers, rethinking schools and empowering communities. As part of its ongoing work on Education for Sustainable Development (ESD) and its role as secretariat to the Greening Education Partnership, UNESCO is currently developing a Green School Quality Standard and Greening Curriculum Guidance to mainstream climate education in schools and educational institutions.