Summary — What This Chapter Covers

1. Urban Growth

1.1 What is urbanisation, really?

It's easy to mix up two different ideas, so let's separate them clearly from the start:

Urban areas differ from rural ones in four key ways worth memorising:

1.2 Why urban growth outpaced total population growth

Between 1950 and 2015, the world's total population roughly doubled — but the urban population more than tripled. Why the gap? Follow the chain of cause and effect:

High rates of urbanisation specifically occur in LEDCs for three overlapping reasons:

1.3 Factors affecting the RATE of urbanisation

Two forces control how quickly a country urbanises:

Rates of urbanisation tend to be lower in MEDCs — not because they aren't urban, but because a high percentage of the population already lives in towns and cities, so there's less room left to "urbanise" further. This is a classic exam trap: don't assume MEDCs are urbanising fastest just because they're highly urban already.

1.4 Millionaire cities, megacities, and conurbations

As cities keep growing, geographers use the term mega city for any urban area with over 10 million people:

1.5 Causes of rapid urban growth (the exam favourite)

This is one of the most commonly tested lists in the whole topic — know the two main engines and their approximate weightings:

Urban Pull Factors

Rural Push Factors

1.6 The urbanisation pathway (5 stages)

Countries follow a broadly predictable pathway as they develop economically. The rate of urbanisation isn't constant — it accelerates, then slows, then can even reverse:

1.7 The urban process timeline (in order)

This is a slightly different sequence — it's about the physical/functional processes a city goes through over time, not the % urbanised:

Causes of Counter-urbanisation

1.8 Urban regeneration vs. urban re-imaging

These two terms get confused constantly in exams — here's how to keep them straight permanently:

Why regeneration is needed in the first place: older parts of urban areas suffer decline as factories move elsewhere → job losses → quality of housing drops → people move away → urban blight sets in → the area needs to be "brought back to life."

1.9 Megacities — reasons for growth

Four main factors explain why megacities keep growing, and it's worth understanding each mechanism rather than just memorising the list:

1.10 World cities

Not all megacities are "world cities," and not all world cities are megacities — size and influence are two different things.

2. Impacts of Urban Growth

Rapid, unplanned urbanisation creates a predictable set of problems — and the speed of development is greatest in LEDCs. São Paulo, Brazil, is a striking example: it grew from 7 million to over 20 million people in just 40 years, making it the second-largest urban area in the Americas.

2.1 Transport problems

• Road and public transport provision tends to be poor in quality, size, and reliability.
• Rapid development means transport systems become easily overloaded and overcrowded.
• Congestion varies by day of week, time of day, weather, and season.
• High vehicle numbers create atmospheric pollution such as smog.
• Because housing is scarce and transport is unreliable, people are pushed to live as close to their employment as possible — often in informal settlements near job centres, adding to overcrowding.

2.2 Housing problems — informal settlements

Housing availability and affordability simply cannot keep pace with LEDC urban population growth. The result: people build their own homes on any vacant land using scrap materials (cardboard, corrugated iron, plastic) — unplanned, unregulated housing with little sanitation, freshwater, or reliable energy.

These settlements are typically found:

Regional names for informal settlements

Famous "mega-slums"

Common problems in informal settlements:

• Overcrowded, poorly built housing using inadequate materials, with uncertain electricity supply
• Restricted access to water supplies
• Little to no sanitation or solid waste disposal → polluted, degraded local environment
• Inadequate health facilities → higher sickness and death rates
• Insecure land tenure — residents can be forcibly removed by landowners or authorities
• Serious risks of fire, flooding, and landslides

2.3 The informal economy

Job creation in megacities cannot match population growth, leading to unemployment and underemployment. People end up doing informal work: shining shoes, giving haircuts, taxi-driving, selling water or food on street corners. These jobs are unskilled, labour-intensive, and cheap to start — but:

2.4 Deprivation, inequality, and the cycle of poverty

Many low-income families are "pulled" toward informal settlements looking for a sense of belonging with others in a similar situation. Without a strong social network, high crime, begging, and petty theft become more common — degrading both the physical and social environment.

Why it's so hard to break: children get less parental support, attend inadequate schools, leave school early with few qualifications, can't find well-paid work, rely on social handouts — and their own children are born straight back into the same cycle.

2.5 Impacts of urban growth on rural areas

Urban growth doesn't just change cities — it transforms the countryside around them too, through the rise of the suburbanised village.

• Originally quiet, independent places with basic services near large urban areas.
• Also called "dormitory or commuter towns" — residential populations that commute to work.
• As people move out for retirement, family, or work reasons, these villages change: new, large, expensive housing estates appear (sometimes gated communities).
• Urban-style services increase — hence the shift in name to "suburbanised" village.
• The commuter belt brings new roads and public transport links.
• New businesses open: pubs, restaurants, supermarkets, hotels.
• Net effect: dilution of traditional country life.

3. Solutions to Impacts of Urban Growth

3.1 Pollution — sources, impacts, and solutions

Towns and cities have less clean air than rural areas. Over the last 60 years, rules have limited emissions in MEDCs, but NICs and LEDCs still face the most pollution today. Here's every pollutant type the exam board expects you to know — source, impact, solution:

Water, Visual & Noise Pollution

3.2 Managing informal settlements — 5 strategies

This is the heart of the whole "solutions" topic — you need to know all five approaches, be able to name a real example for each, and be ready to evaluate their strengths and weaknesses.

1. Bulldoze and Clear Away

2. Clear Away but Relocate People

3. Redevelop

A more extreme strategy: completely remove squatter areas and rebuild in a structured, formal manner. Used historically in the UK for inner-city slum sites — and is currently the suggested/adopted strategy for Dharavi, Mumbai, India, where the city's goal is to raise living standards by demolishing informal settlements and replacing them with high-rise tower blocks.

4. Self-Help / Site-and-Service Schemes

5. Ignore

Some local governments either ignore informal settlements hoping they disappear, or simply lack funds to redevelop. Interestingly, this isn't always a total failure: many residents gradually improve their own homes' stability, durability, and quality by buying better materials and doing the work themselves — as seen in parts of Rocinha, Rio. In some areas, communities become so self-sufficient and stable that authorities are no longer needed to provide help at all.

3.3 Government investment example

The Brazilian Federal Savings Bank offered locals 100% mortgages to purchase homes. This shifts upkeep and improvement responsibility from the government to the homeowner, freeing up public money for infrastructure (paved roads, sewers, streetlights). However, many favelas have limited or no access to public transport, making it hard for residents to reach work — so many fall behind on mortgage payments. This is a great example of a solution that looks good on paper but has a real practical flaw worth mentioning in evaluation-style answers.

4. Case Study: Rio de Janeiro, Brazil

Migration into Rio

• Rapid rural-to-urban migration in search of jobs.
• Despite a large agricultural base, there's no land ownership and few opportunities for progress in rural areas.
• Farming is challenging and unprofitable, with poor pay and significant wealth gaps; rural areas are vulnerable to natural disasters and lack social facilities.
• The city offers better job opportunities, higher wages, better schooling and healthcare, and the potential for a greater quality of life.

Housing — the Favelas

• Inward migration puts pressure on services and amenities → housing shortage.
• Rocinha is the biggest and most developed favela — where most rural migrants start their lives.
• Around 1,000 favelas in and around Rio house more than 20% of the population, mostly on unsuitable land on the city's edge.
• Many favelas are well-established, even though residents have no legal rights to the land: 75% of favela homes have tiled floors, and 95% are built of solid materials like masonry — some even have computers, TVs, running water, electricity, and internet.
• Newer, less-established settlements clinging to the mountainside are overcrowded and built from corrugated iron and timber.

Transport

Urban infrastructure planning has not kept pace with Rio's rapid expansion. Roads are seriously congested, rail service is limited, and private buses provide much of the public transport. As population and wealth grow, more cars appear on the roads. The underground train system is effective but has limited stops.

Education

• Children start school at age 4; due to limited classroom space, school days often only last three to four hours.
• Brazil invested late in its education system, so quality is frequently poor, and many of Rio's public schools badly need repair.
• Rio has high rates of teenage pregnancy, school absences, and limited educational possibilities.
• Violence is a real barrier to education — it isn't always safe for children to travel to school in certain neighbourhoods.

Crime

Crime rates have increased as the city has grown, partly due to high unemployment and small crimes like pickpocketing. Youth crime and gang violence within the favelas are a serious problem — many residents feel unsafe as gangs control the streets with guns and drug trade.

Environmental Challenges

• Many households lack safe running water — main pipes are broken and leaking, and very few favela homes have directly piped water.
• Most favela residents illegally tap into the main electrical grid, making street poles unsafe with multiple households sharing a single connection.
• Limited access to doctors and healthcare increases the risk of diseases like cholera and typhoid spreading.
• Urban sprawl continues into nearby rural areas.
• Air pollution is serious, especially from industry and traffic jams in the city centre.
• In favelas with no organised sewage/waste systems, untreated sewage flows into rivers and Guanabara Bay, polluting water and harming marine life.

Approaches to Improvement in Rio

The government views favelas as eyesores that give the city a poor image, so local communities, charities, and government departments collaborate to improve conditions — while trying to avoid attracting even more inward migration and further favela growth elsewhere.

5. What to Memorise

6. Concepts Checklist

7. Exam Tips