While many are born into prosperity, hundreds of millions of people lead lives of almost unimaginable poverty. Our world remains hugely unequal, with our place of birth continuing to exert a major influence on our opportunities. In this accessible book, leading political theorist Chris Armstrong engagingly examines the key moral and political questions raised by this stark global divide. Why, as a citizen of a relatively wealthy country, should you care if others have to make do with less? Do we have a moral duty to try to rectify this state of affairs? What does 'global justice' mean anyway - and why does it matter? Could we make our world a more just one even if we tried? Can you as an individual make a difference? This book powerfully demonstrates that global justice is something we should all be concerned about, and sketches a series of reforms that would make our divided world a fairer one. It will be essential introductory reading for students of global justice, activists and concerned citizens.