The OECD's Survey on Social and Emotional Skills (SSES) 2023 represents the largest global initiative to gather comparable data on the development of social and emotional skills -- including creativity, empathy, achievement motivation, responsibility and collaboration skills -- among 10- and 15-year-old students. The report -- Nurturing Social and Emotional Learning Across the Globe -- reveals striking disparities both within and between participating countries and subnational entities in how these critical skills are fostered in schools, homes and society. These findings offer insights into the relationship between educational environments and student outcomes, highlighting the urgent need for improvements. Key recommendations focus on enhancing school policies and practices (e.g. teachers' feedback, training, preparedness and attitudes; teaching of these skills across subjects offline, digitally and remotely; and extra-curricular activities), improving school climates (e.g. student belonging; relationships; and handling of bullying and stress), and advancing gender equality (e.g. challenging stereotypes; and ensuring equitable access to careers and parental support for skill development). This report serves as a vital resource for policymakers and practitioners seeking to improve social-emotional learning worldwide.