One billion people worldwide live in slums, a number that will likely double by 2030. The characteristics of slum life vary greatly between geographic regions, but they are generally inhabited by the very poor or socially disadvantaged.
There was significant publicity last year when the world population reached 7 billion. Barely a whisper was heard when the global population of slum dwellers exceeded 1 billion. When the world's population reached 7 billion, it was used as a moment to reflect on sustainable growth, resources and the common good for humanity. This 'milestone' of 1 billion slum dwellers needs to also serve as a teaching moment to reflect on urbanization, migration, human development and the underlying causes that have lead to this explosive growth primarily in the developing world.
Via Seth Dixon