Suburbanization is the movement of people from dense central urban areas to lower-density areas on the urban periphery. In IB ESS, this is core SL and HL content in subtopic 8.2, Urban systems and urban planning.
Suburbanization changes both the spatial structure of a city and the operation of the wider urban system. People, housing, businesses and services move outward, while flows of energy, water, materials, waste and transport extend across a larger area.
| Aspect | Causes or characteristics | Possible consequences |
|---|---|---|
| Housing | Demand for larger or more affordable homes | Low-density development and increased land consumption |
| Transport | Greater car ownership and improved road networks | Longer journeys, congestion, air pollution and greenhouse gas emissions |
| Land use | Development at the rural to urban fringe | Habitat loss, soil sealing and fragmentation of ecosystems |
| Society | Movement of wealthier households and services outward | Reduced tax revenue or investment in central areas and unequal access to services |
A common misconception is that suburbanization is the same as urbanization. Urbanization is an increase in the proportion of a population living in urban areas, whereas suburbanization is specifically outward movement from dense central areas to lower-density peripheral areas.
Suburbanization may produce urban sprawl, especially where development is dispersed and automobile-dependent. For example, the Atlanta metropolitan area in the United States has experienced extensive low-density expansion, increasing road use and converting surrounding habitats and agricultural land.
Its impacts depend on planning. Compact, mixed-use suburbs with public transport can reduce resource use, while poorly connected suburbs may increase fossil-fuel consumption. Perspectives also differ: residents may value space and affordable housing, while planners or ecocentric groups may prioritize habitat protection and lower emissions. Environmental justice matters because low-income groups may be left with weaker services or displaced by changing land values.