How is the world becoming more urban, and how can cities be made socially and environmentally sustainable?
Urbanisation and its processes; urban forms and social and economic issues; the urban climate and ecological footprint; urban drainage and waste; and strategies for managing sustainable urban environments.
A focused answer to AQA A-Level Geography 3.2.3, covering urbanisation and its processes, urban forms and social and economic issues, the urban climate and ecological footprint, urban drainage and waste, and strategies for sustainable urban living.
Reviewed by: AI editorial process; not yet individually human-reviewed
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What this dot point is asking
AQA section 3.2.3 wants you to explain urbanisation and the processes that reshape cities, analyse the social and economic issues of urban areas, describe the distinctive urban climate and ecological footprint, explain urban drainage and waste challenges, and evaluate strategies for sustainable urban living. The topic is applied to contrasting urban case studies, so naming real processes and figures strengthens every answer.
Urbanisation and its processes
A predictable cycle of linked processes reshapes cities over time. Suburbanisation is outward growth at the city edge, enabled by transport and rising car ownership. Counter-urbanisation is movement from cities to rural and peri-urban areas, often by those seeking a better quality of life. Urban resurgence and re-urbanisation describe people and investment returning to the inner city, frequently linked to regeneration and gentrification, which can revive an area but displace existing low-income residents.
Social and economic issues
Urban areas concentrate both opportunity and inequality. They show economic inequality, social segregation (by income, ethnicity and tenure), cultural diversity, and stark contrasts between deprivation and wealth, sometimes within a single district. Issues include housing affordability and shortage, informal settlements and slums in developing-world cities, deindustrialisation leaving derelict land and structural unemployment, and uneven access to services. Urban regeneration and rebranding attempt to revive declining districts, with mixed social outcomes.
The urban climate and ecological footprint
Drainage, waste and sustainable cities
Replacing permeable ground with impermeable concrete and tarmac reduces infiltration and speeds surface runoff, shortening hydrograph lag times and raising flood risk; sustainable urban drainage systems (SUDS), permeable surfaces, green roofs and river restoration help restore infiltration and storage. Waste management (landfill, incineration with energy recovery, recycling and the circular economy) is a growing environmental challenge as consumption rises.
A sustainable urban environment balances economic, social and environmental needs for present and future generations. Strategies include integrated and public transport to cut car use and emissions, water and waste recycling, green space and urban greening, energy efficiency and renewable supply, and careful land-use planning, sometimes designed in from scratch as eco-cities.
Try this
Q1. Define urbanisation. [2 marks]
- Cue. The increase in the proportion of a population living in urban areas.
Q2. State one strategy for making a city more sustainable. [1 mark]
- Cue. Public or integrated transport, water and waste recycling, or green-space provision.
Q3. Explain why urbanisation can increase flood risk in a city. [4 marks]
- Cue. Impermeable surfaces reduce infiltration and speed surface runoff, shortening hydrograph lag time and raising peak discharge, overwhelming drainage.
Exam-style practice questions
Practice questions written in the style of AQA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
AQA 20196 marksExplain the causes of the urban heat island effect.Show worked answer →
A 6 mark "explain" question rewarding several linked causes (AO1). The urban heat island (UHI) is the way urban areas are warmer than the surrounding countryside, especially at night.
Dark surfaces such as concrete, brick and tarmac have a low albedo and a high thermal capacity, so they absorb and store heat during the day and release it slowly at night. Anthropogenic heat from vehicles, industry, air conditioning and people adds energy directly. The urban canyon geometry of tall buildings traps long-wave radiation by multiple reflection and reduces wind speed (and so convective cooling), while a lack of vegetation and open water reduces cooling by evapotranspiration, and a pollution dome can absorb and re-radiate heat.
Strong answers identify several causes and link each to the warming mechanism rather than just listing them. Markers reward this multi-factor explanation.
AQA 20226 marksTwo cities have ecological footprints of 6.8 and 2.1 global hectares per person. City A has 3.2 million people and City B has 5.0 million people. Calculate the total footprint of each city and explain what the figures suggest about sustainability.Show worked answer →
A calculation question (AO3 numeracy plus AO1 interpretation). Total footprint equals per-capita footprint multiplied by population.
City A: global hectares (about 21.8 million gha). City B: global hectares (10.5 million gha). State units.
Interpret: City A has a far larger total footprint despite a smaller population, because its per-capita consumption is over three times higher. This suggests City A is less sustainable, drawing on far more land and resources per person, typical of a high-income city. Per-capita footprint matters more than population size for sustainability. Markers reward correct multiplication, units, and linking the figures to per-capita consumption and sustainability.
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Sources & how we know this
- AQA A-level Geography (7037) specification — AQA (2016)