What you'll learn
More than half the world's population now lives in towns and cities, and this topic examines why, what problems that growth creates, and how cities can be made more sustainable. For AQA GCSE Geography you need to understand the global pattern of urbanisation, the causes and consequences of rapid growth in a city in a lower-income or newly emerging economy, the opportunities and challenges facing a major UK city, and the principles of sustainable urban living. The examiner is looking for balance: rapid urban growth brings serious problems, but it also brings opportunities, and strong answers recognise both. This guide covers urbanisation and its causes, the growth of megacities, squatter settlements and urban challenges, UK urban opportunities and problems including urban regeneration, and strategies for sustainable cities and traffic management. By the end you should be able to explain why cities grow, evaluate attempts to manage that growth, and judge how sustainable a given urban scheme really is.
Key terms and definitions
Urbanisation — The increase in the proportion of a population living in towns and cities.
Megacity — A city with a population of over 10 million people.
Rural–urban migration — The movement of people from the countryside into towns and cities.
Push factor — Something that drives people away from an area, such as poverty or lack of jobs.
Pull factor — Something that attracts people to an area, such as employment or better services.
Natural increase — Population growth caused by birth rate exceeding death rate.
Squatter settlement — An area of poor-quality housing built illegally on land the residents do not own.
Informal economy — Work that is not taxed, regulated or officially recorded.
Urban sprawl — The unplanned outward spread of a built-up area into the surrounding countryside.
Urban regeneration — The redevelopment of a run-down urban area to improve it.
Brownfield site — Land that has been built on before and is available for redevelopment.
Greenfield site — Land that has not previously been built on.
Deprivation — A lack of the resources and services considered normal in a society.
Sustainable urban living — Meeting the needs of city residents today without damaging the ability of future generations to meet theirs.
Integrated transport system — Different forms of public transport linked together so journeys can be made easily across them.
Core concepts
Urbanisation and its causes
Urbanisation is driven by two things working together: rural–urban migration and natural increase. Migration happens because of push factors in the countryside — limited employment, low wages, poor services, mechanisation of farming, drought or conflict — and pull factors in the city — more and better-paid jobs, healthcare, education, and the perception of a better quality of life. Natural increase then adds to the effect, because the migrants are typically young adults of childbearing age, so birth rates in the city are high.
Rates of urbanisation differ sharply by development level. In higher-income countries urbanisation happened earlier, largely during industrialisation, and is now slow or even reversed in places through counter-urbanisation. In lower-income and newly emerging economies urbanisation is currently rapid, which is why the world's fastest-growing cities and most new megacities are found there.
Opportunities of urban growth
Urban growth is frequently portrayed only as a problem, but the exam rewards recognising the opportunities. Cities concentrate economic activity, so there are more jobs and the chance of higher wages. Services are more accessible: healthcare, education and water and electricity supply can be delivered more cheaply to a dense population than a scattered rural one. Cities generate the tax revenue that funds development, and the informal economy provides income for people who cannot find formal work, including recycling, street trading and small-scale manufacturing.
Challenges of rapid urban growth
Where growth outpaces the ability to provide housing and services, problems follow. Squatter settlements develop, built from scavenged materials on land the residents do not own, often on unsafe sites such as steep slopes or floodplains because safer land is already occupied.
Associated challenges include inadequate clean water and sanitation, which spreads waterborne disease; limited access to healthcare and education; unemployment and underemployment, pushing people into the informal economy; traffic congestion and the air pollution that comes with it; waste disposal problems where collection does not reach every area; and crime. Environmental challenges include water pollution from untreated sewage and industrial waste, and loss of surrounding farmland to urban sprawl.
You should study one named city in a lower-income or newly emerging economy, and know why it has grown, the specific challenges it faces, and at least one scheme intended to improve life there. Use the figures and named details from the case study you have been taught, since precise evidence is what separates a top-band answer here.
Managing growth: improving squatter settlements
Approaches include self-help schemes and site and service schemes, in which residents are given land, building materials and basic infrastructure and build or improve homes themselves. These are cheap, use local labour and give residents ownership and pride in the result, but progress can be slow and quality varies.
Larger urban planning schemes may provide proper water, sanitation and electricity connections, formal land ownership, schools and clinics. These can transform conditions but are expensive, and rehousing people in high-rise blocks away from their existing networks and workplaces has often proved unpopular and unsuccessful.
UK cities: opportunities
A major UK city offers social and economic opportunities that you should be able to describe. Cultural mix arising from migration brings variety in food, music, festivals and places of worship. Recreation and entertainment — sport, theatres, museums, restaurants — are concentrated in cities. Employment is available across a wide range of sectors, with a marked shift from manufacturing towards services, finance, retail and the creative and digital industries. Integrated transport systems make the city accessible. Urban greening projects create parks and green corridors that improve air quality, provide recreation and support wildlife.
UK cities: challenges
Challenges include inequality and deprivation, which can vary enormously between neighbourhoods within a single city, affecting life expectancy, health, income, education and employment. Housing is in short supply and expensive, raising the brownfield-versus-greenfield question. Urban sprawl places pressure on the rural–urban fringe and on green belt land. Dereliction leaves abandoned buildings and contaminated land in areas that have lost their former industry. Waste disposal and air pollution, particularly from traffic, remain persistent problems.
Brownfield sites reduce pressure on the countryside, use existing services and improve derelict areas, but are often contaminated and expensive to prepare. Greenfield sites are cheaper and easier to build on and can be laid out as planned, but consume countryside and encourage car dependence.
Urban regeneration
Regeneration schemes redevelop run-down areas, typically where industry has declined. You should know one UK example, including why the area needed regeneration — job losses, dereliction, population decline, poor housing — and the main features and impacts of the scheme. Benefits usually include new housing, employment, improved transport and leisure facilities, and a restored image. Criticisms commonly include high cost, new housing being unaffordable for existing residents, jobs not matching local skills, and gentrification displacing the original community. A judgement that weighs who benefits is stronger than one listing the improvements alone.
Sustainable urban living
Sustainability in a city rests on managing four things. Water conservation through recycling grey water, collecting rainwater and reducing leakage. Energy conservation through insulation, renewable generation and efficient building design. Waste recycling to reduce landfill and recover materials. Creating green space to improve air quality, reduce flood risk through infiltration, provide recreation and support biodiversity.
Traffic management is a related strand. Strategies include improving and integrating public transport, congestion charging, park and ride schemes, cycle lanes and pedestrianised zones, and ring roads that keep through traffic out of the centre. Each has drawbacks — cost, unpopularity, or simply shifting congestion elsewhere — and evaluation questions expect these to be acknowledged.
Worked examples
Example 1: Explaining rapid urban growth in a lower-income country
Rural areas offer few jobs, low incomes and poor services, and farming may have been mechanised or affected by drought, pushing people away. Cities offer more employment, better healthcare and education and higher wages, pulling them in. Because migrants are mostly young adults, birth rates in the city are high, so natural increase adds to the migration. The two processes together produce growth faster than housing and services can be built, which is why squatter settlements appear.
Example 2: Explaining why squatter settlements are often on hazardous land
Safe, accessible, well-serviced land is already owned and occupied, and is too expensive for new arrivals. The land left available is that which nobody else wants — steep slopes liable to landslides, floodplains, land beside railways or rubbish tips. People build there because proximity to work in the city outweighs the risk, and because they have no legal alternative.
Example 3: Evaluating a self-help scheme
Self-help schemes are cheap for the authorities, use residents' own labour and skills, and give legal security that encourages further investment in the home. However, improvement depends on residents having time and money, so progress is uneven; building quality is not guaranteed; and the schemes do not by themselves provide jobs. A reasonable judgement is that they improve housing effectively but address only part of the problem.
Example 4: Judging how sustainable an urban scheme is
Apply the four strands. Does it conserve water and energy? Does it reduce waste? Does it add green space? Then ask the harder question: is it affordable for existing residents, and does it reduce car dependence? A development with solar panels and a park but no public transport and prices beyond local incomes is only partly sustainable, and saying so explicitly earns the evaluation marks.
Common mistakes and how to avoid them
Treating urbanisation and urban growth as identical. Urbanisation is the rising proportion of people in urban areas; a city can grow in size without the national proportion changing much.
Forgetting natural increase. Migration alone does not explain the speed of growth; migrants are young, so birth rates are high.
Presenting squatter settlements as wholly negative. They also demonstrate strong community organisation and provide affordable shelter and informal employment.
Listing challenges without explaining consequences. Poor sanitation matters because it spreads waterborne disease; say so.
Confusing brownfield and greenfield. Brownfield has been built on before; greenfield has not.
Ignoring who benefits from regeneration. Gentrification and affordability are the key evaluative points.
Assuming sustainable means only environmental. Social and economic sustainability — affordability, employment, community — count too.
Exam technique for "Urban Issues and Challenges"
Use the push-and-pull framework for any question about why cities grow, and always add natural increase.
Give both opportunities and challenges. Questions in this topic are frequently framed to reward balance, and one-sided answers are capped.
Know two contrasting case studies in detail — one city in a lower-income or newly emerging economy, one major UK city — with named schemes and specific evidence from each.
For regeneration and sustainability questions, ask who gains and who loses. That distinction is where the highest marks sit.
Use the four sustainability strands — water, energy, waste, green space — as a ready-made structure for planning answers.
Watch the command word: "describe" wants the pattern, "explain" wants the cause, "assess" and "evaluate" want a judgement backed by evidence.
Quick revision summary
- Urbanisation is driven by rural–urban migration (push and pull factors) plus natural increase from a young migrant population.
- Urbanisation is now fastest in lower-income and newly emerging economies; higher-income countries urbanised earlier and may see counter-urbanisation.
- Opportunities: jobs, healthcare, education, services delivered more cheaply, and the informal economy.
- Challenges: squatter settlements, poor water and sanitation, unemployment, congestion, pollution, waste and crime.
- Squatter settlements are improved by self-help and site and service schemes — cheap and empowering, but slow and uneven.
- UK city opportunities: cultural mix, recreation, employment, integrated transport, urban greening.
- UK city challenges: deprivation and inequality, housing shortage, urban sprawl, dereliction, waste and air pollution.
- Brownfield: uses existing services, but contaminated and costly. Greenfield: cheaper to build on, but consumes countryside.
- Sustainable urban living rests on water conservation, energy conservation, waste recycling and green space, supported by traffic management.