Ages of Globalization is a free, multidisciplinary online course designed to empower a global community of learners — students ages 14+, educators, and lifelong learners alike — to address today’s sustainable development challenges. This course takes participants on an immersive journey through seven transformative ages of human history, examining how geography, technology, and institutions have shaped our interconnected world. Based on Professor Jeffrey D. Sachs' influential book, the course deepens learners’ understanding of global history, the forces driving large-scale change, and innovative solutions for a sustainable future. Through dynamic video lectures, virtual visits to UNESCO World Heritage Sites, expert interviews, cutting-edge ESD lesson plans, and engaging activities, learners are equipped with the knowledge, skills, attitudes, and values to tackle complex global issues. The course also includes UN at Your Doorstep, a live online series that gives young people the unique opportunity to engage directly with global leaders in monthly dialogues on the most pressing issues of our time, from peace and security, climate change, poverty, inequalities, environmental sustainability, and artificial intelligence, with a particular emphasis on how young people can take action.