Urbanisation is the defining feature of global population distribution. Until at least 2050, city growth will be concentrated in developing countries and most of that growth will come from migration from rural areas. Many poor, rural migrants will end up in the poorest neighbourhoods of these cities.
Urbanisation in low-income nations presents both opportunities and immense challenges. As urban centres grow rapidly, inadequate housing and the lack of basic infrastructure and services affect a large and growing proportion of their population. There is also a growing body of evidence on urban poverty and its links with environmental hazards.