By 2050, an additional 2.5 billion people will be living in the world’s towns and cities, almost 50% of them in the 56 Commonwealth countries. To a significant extent, the future of the planet hangs on how cities and human settlements are managed. It is in our cities that the emissions creating climate catastrophe are stoked and where change can – and must – make a difference at scale. Food security, water, basic services, migration, shelter, jobs, environment: sustainable urbanisation is about changing direction to strive for a fairer and less environmentally damaging future. This well-illustrated book by authors from around the Commonwealth tells how the Commonwealth Association of Planners across five decades has campaigned to make a difference. It also looks ahead, scoping the urgent, practical action that is now required.