Urbanisation, Megacities, Urban Regeneration & Sustainable Cities
Urbanisation is the increasing proportion (percentage) of a country's total population living in towns and cities, driven globally by rural-to-urban migration (push and pull factors) and high rates of natural increase among young urban populations. While High-Income Countries (HICs) like the UK urbanised early during the Industrial Revolution and now experience counter-urbanisation and inner-city regeneration, Low-Income Countries (LICs) and Newly Emerging Economies (NEEs) are experiencing rapid urbanisation that has created megacities (populations over 10 million) with informal squatter settlements. Examiners frequently test case-study evaluations of NEE squatter settlement improvements (such as Rio's Favela Bairro Project), UK brownfield vs greenfield regeneration (such as the London Docklands / Olympic Park), and sustainable urban transport and water conservation strategies.
- Urbanisation, Push/Pull Factors & Natural Increase
- Urbanisation is the increase in the percentage of a population living in towns and cities. Driven by two mechanisms: 1. Rural-to-urban migration: Push factors driving people out of the countryside (mechanisation of farming, drought/crop failure, lack of schools/healthcare, poverty) and Pull factors attracting them to cities (higher-paid factory/service jobs, universities, hospitals, better infrastructure). 2. Natural increase (birth rate > death rate), which is high in cities because migrants are mostly young adults of child-bearing age.
- Megacities (Population > 10 Million)
- A megacity is an urban area with a total population exceeding 10 million people (e.g., Tokyo, Delhi, Shanghai, São Paulo, Mumbai, Lagos). Most new and fastest-growing megacities are located in Asia and Africa (NEEs and LICs), acting as national economic hubs that generate a huge share of national GDP via formal and informal employment.
- NEE City Challenges & Squatter Settlements (Rio / Mumbai)
- Rapid urban growth outstrips housing supply, forcing low-income migrants to build informal squatter settlements (favelas in Rio de Janeiro, e.g., Rocinha; or Dharavi in Mumbai) on steep hillsides or marshland. Challenges include: overcrowded poorly built houses vulnerable to landslides, lack of clean piped water and sanitation (sewage in open drains), illegal electricity connections, high unemployment/informal low-paid jobs, air/water pollution, and high crime rates.
Urbanisation, Megacities, Urban Regeneration & Sustainable Cities: Flood Hydrographs, Plate Margins & Global Systems
Test how land use changes storm hydrograph lag times, compare plate boundaries, and inspect global atmospheric cells and the Demographic Transition Model.
Stage 2 (Early Expanding — LICs e.g. Afghanistan / Niger): Death Rate falls rapidly due to clean water, vaccinations, and basic healthcare, while Birth Rate remains high. Natural increase is at its steepest, giving a wide-based youthful population pyramid.
Key Concepts & Exam Definitions (6)
- Urbanisation, Push/Pull Factors & Natural Increase
- Urbanisation is the increase in the percentage of a population living in towns and cities. Driven by two mechanisms: 1. Rural-to-urban migration: Push factors driving people out of the countryside (mechanisation of farming, drought/crop failure, lack of schools/healthcare, poverty) and Pull factors attracting them to cities (higher-paid factory/service jobs, universities, hospitals, better infrastructure). 2. Natural increase (birth rate > death rate), which is high in cities because migrants are mostly young adults of child-bearing age.
- Megacities (Population > 10 Million)
- A megacity is an urban area with a total population exceeding 10 million people (e.g., Tokyo, Delhi, Shanghai, São Paulo, Mumbai, Lagos). Most new and fastest-growing megacities are located in Asia and Africa (NEEs and LICs), acting as national economic hubs that generate a huge share of national GDP via formal and informal employment.
- NEE City Challenges & Squatter Settlements (Rio / Mumbai)
- Rapid urban growth outstrips housing supply, forcing low-income migrants to build informal squatter settlements (favelas in Rio de Janeiro, e.g., Rocinha; or Dharavi in Mumbai) on steep hillsides or marshland. Challenges include: overcrowded poorly built houses vulnerable to landslides, lack of clean piped water and sanitation (sewage in open drains), illegal electricity connections, high unemployment/informal low-paid jobs, air/water pollution, and high crime rates.
- Managing Squatter Settlements (Site and Service Schemes)
- Instead of bulldozing slums, self-help and site-and-service schemes (such as Rio's Favela Bairro Project) upgrade existing communities by providing: legal land ownership (tenure), paved roads for rubbish collection and emergency vehicles, piped clean water and underground sewers, street lighting, health clinics, schools, and low-cost micro-loans/materials for residents to brick-and-plaster their own homes.
- UK Urban Change: Deindustrialisation & Regeneration
- Since the 1960s, containerisation and overseas competition caused deindustrialisation in UK inner cities and port areas (e.g., London Docklands, Liverpool, Birmingham), creating derelict brownfield land, high unemployment, and a spiral of multiple deprivation. Urban regeneration projects (e.g., Queen Elizabeth Olympic Park in Stratford, Lower Lea Valley) clean up polluted brownfield land, build affordable housing, create parks, and construct transport hubs (Crossrail) to attract high-tech and financial businesses, though they can cause gentrification (pricing out original working-class residents).
- Sustainable Urban Living & Traffic Management
- A sustainable city minimises resource inputs (water, energy, food) and waste outputs (landfill, air pollution, CO₂). Strategies include: 1. Water & energy conservation (dual-flush toilets, greywater recycling, solar panels, combined heat and power plants). 2. Waste recycling and composting. 3. Green spaces (cool the urban heat island, absorb CO₂, intercept rainfall to reduce flooding, improve mental health). 4. Traffic congestion schemes (London Congestion Charge / ULEZ, Park-and-Ride schemes, dedicated bus/cycle lanes, and integrated tram systems).
Quick-Fire Flashcards (6)
Click any card to check the answer, then mark it as Known to track your progress.
Define a 'megacity' and state the two causes of urbanisation.
Distinguish between the 'formal economy' and the 'informal economy' in an NEE city.
Give three social/environmental challenges of living in a squatter settlement (e.g., Rocinha in Rio or Dharavi in Mumbai).
Explain how Rio's 'Favela Bairro' site-and-service project improved quality of life for residents.
Compare two advantages of building on Brownfield sites versus Greenfield sites in the UK.
State three ways a city can reduce urban traffic congestion and vehicle air pollution.
Exam-Style Questions & Mark Schemes (4)
Write or think through your answer first, then click Check Mark Scheme to see the exact points examiners award marks for.
- Q1
Using a named example of a city in a LIC or NEE you have studied, evaluate the effectiveness of strategies used to improve the quality of life for the urban poor in squatter settlements. [6 marks]
Click “Check Mark Scheme” to compare your answer, 1. Named case study: Rio de Janeiro, Brazil (the Favela Bairro Project, a £200 million site-and-service scheme in favelas such as Complexo do Alemão and Rocinha) [1 mark]. 2. Social/Infrastructure successes: Roads were paved and named (allowing ambulances and rubbish trucks access), clean water pipes and sewers were installed (reducing waterborne diseases and infant mortality), and a 3.5 km cable car system gave residents fast, cheap access to formal jobs in the city [1 mark]. 3. Economic/Housing successes: Residents were granted legal land ownership (tenure) and given credit/materials for self-help housing upgrades, plus training in skills like computing and dressmaking [1 mark]. 4. Limitations of scale and funding: The £200 million budget was not enough to reach all of Rio's 1,000+ favelas, as continuous rural-to-urban migration causes new squatter huts to grow faster than authorities can upgrade them [1 mark]. 5. Maintenance and social limitations: Newly built infrastructure and the Complexo do Alemão cable car were poorly maintained and eventually closed due to budget cuts after the 2016 Olympics, and literacy/employment training had limited impact [1 mark]. 6. Evaluation: While the Favela Bairro Project significantly improved physical living conditions in targeted favelas, drug gang violence and deep economic inequality remain unresolved despite Police Pacifying Units (UPPs) [1 mark].
- Q2
Explain how rural push factors and urban pull factors combine with natural increase to cause rapid growth in LIC/NEE cities. [4 marks]
Click “Check Mark Scheme” to compare your answer, 1. Rural push factors force people to leave the countryside, such as agricultural mechanisation reducing farm jobs, soil erosion/drought causing crop failure, and a lack of secondary schools and hospitals [1 mark]. 2. Urban pull factors attract migrants to the city, such as the prospect of higher-paid, regular employment in manufacturing and services, better healthcare, universities, and reliable water/electricity supplies [1 mark]. 3. Because the majority of rural-to-urban migrants are young adults aged 18 to 35 (child-bearing age), their arrival raises the city's birth rate [1 mark]. 4. Combined with lower urban death rates (due to closer access to hospitals), this creates a high rate of natural increase (births minus deaths) that compounds migration growth [1 mark].
- Q3
Using a named UK urban regeneration project you have studied, explain why the area needed regeneration and assess the social, economic, and environmental impacts of the project. [6 marks]
Click “Check Mark Scheme” to compare your answer, 1. Named UK case study: The Lower Lea Valley / Stratford in East London (regenerated for the 2012 London Olympic Games into the Queen Elizabeth Olympic Park) [1 mark]. 2. Why regeneration was needed: Deindustrialisation and closure of traditional docks and factories left vast areas of derelict, polluted brownfield land, poor transport links, and severe social deprivation (unemployment, low educational attainment, and poor health) [1 mark]. 3. Environmental successes: Over 2 million tonnes of toxic industrial soil were cleaned, waterways were dredged, and 100+ hectares of green parkland and wetland habitats were created alongside sustainable stadium venues [1 mark]. 4. Economic successes: Construction of the Westfield Stratford City shopping centre, the International Quarter office hub, and major transport upgrades (Jubilee Line, High Speed 1, and Elizabeth Line) created tens of thousands of jobs and attracted billions in investment [1 mark]. 5. Social negatives (Gentrification): Although 10,000 new homes were planned in East Village, land values and private rents rocketed, pricing out original low-income Newham residents (gentrification) and falling short on promises of genuinely affordable social housing [1 mark]. 6. Displacement: Hundreds of existing small businesses and low-cost housing units (such as the Clays Lane estate) were compulsorily purchased and demolished, breaking up established local communities [1 mark].
- Q4
Explain how urban transport strategies and green spaces can make a city more environmentally and socially sustainable. [4 marks]
Click “Check Mark Scheme” to compare your answer, 1. Integrated public transport (such as Curitiba's Bus Rapid Transit system or Freiburg's tram network) and Park-and-Ride schemes encourage commuters out of private petrol/diesel cars [1 mark]. 2. Fewer cars on the road reduces traffic congestion (saving economic time and stress) and cuts emissions of carbon dioxide (a greenhouse gas) and nitrogen oxides/particulates (improving urban air quality and respiratory health) [1 mark]. 3. Urban green spaces (parks, green roofs, and street trees) act as carbon sinks that absorb CO₂ and cool the city via evapotranspiration, reducing the urban heat island effect [1 mark]. 4. Green spaces also provide permeable surfaces that allow rainwater infiltration (reducing surface runoff and urban flash-flood risk) while offering recreation areas that improve residents' physical and mental wellbeing [1 mark].
Common Exam Questions (4)
What is the exact difference between 'urban growth' and 'urbanisation'?
Be very careful with your wording. Urban growth is simply an increase in the total number of people living in cities. Urbanisation is an increase in the proportion (or percentage) of a country's total population living in urban areas compared to rural areas.
Why is urbanisation happening fastest in LICs and NEEs, but very slowly in HICs?
In HICs (like the UK), over 80% of the population already lives in cities (having urbanised during the 18th-19th century Industrial Revolution), and many affluent people now move out to rural commuter villages (counter-urbanisation). In LICs and NEEs, a large rural population is still migrating rapidly to cities for manufacturing and service jobs, and the youthful migrant population has a high birth rate (natural increase).
What are the advantages and disadvantages of building new housing on Brownfield sites vs Greenfield sites?
Brownfield sites are derelict, previously developed urban land (e.g., disused factories or docks): building on them improves the urban environment, uses existing water/road infrastructure, and reduces urban sprawl, though decontaminating polluted soil and demolishing old structures is expensive. Greenfield sites are undeveloped farmland or woodland on the rural-urban fringe: they are cheaper and easier to build on with more space, but they destroy natural habitats, reduce permeable surfaces (increasing flood risk), and encourage car commuting.
How do cities like Freiburg (Germany) or Curitiba (Brazil) achieve urban sustainability?
Sustainable cities meet the needs of current residents without compromising future generations by combining: 1. Integrated public transport (rapid bus transit lanes, trams, and cycle networks to cut congestion and air pollution). 2. Water conservation (permeable pavements, green roofs, and rainwater harvesting). 3. Energy conservation (solar panels and burning waste biogas for district heating). 4. Accessible urban green spaces.
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