This book presents 101 inequalities categorized across three tiers, each illustrating how disparities manifest and persist. The first tier focuses on contextual factors, exploring inequalities in economic, political, and societal dimensions. The second tier examines baselines, analyzing inequalities related to timing/season (e.g., inequality of opportunity and natural environment), space/location (e.g., geographical location and external environment), and human condition (e.g., age, gender, and ethnicity). The third tier investigates the tangibles—materials and resources, assessed through four key categories: availability, awareness, accessibility, and utility. By examining these through global case studies, authors not only validate the systemic and non-systemic inequalities of our contemporary society but also propose pathways toward truly just, inclusive, and people-centric sustainable development. Authors hope this book sparks transformative thinking and action against the entrenched inequalities shaping our world. While authors may have drifted away from the vision of just and inclusive societies, the authors must find their way back—toward a future where equity is not a privilege, but a fundamental right. More than just an academic discourse, this book is a call to action, particularly for the next generation—those who seek to dismantle systemic inequalities and build sustainable futures for the many, rather than just the privileged few or the bliss of the affluent minority.