IGCSE Geography: Urban Environments

Page 1: Urban Environments Overview

Key Concepts

Urbanisation

  • Definition: The process by which an increasing percentage of a country's population comes to live in urban areas through rural-urban migration or natural increase.

Suburbanisation

  • Definition: The outward growth of towns and cities, engulfing surrounding villages and rural areas.

  • Example: Greater Manchester's agglomeration from its City Centre to Altrincham.

Counter-urbanisation

  • Definition: Movement of populations from large urban areas to smaller urban settlements.

Re-urbanisation

  • Definition: Migration back to inner city areas often as a result of regeneration (e.g., Ancoats, Manchester).

Megacity

  • Definition: A city with over 10 million inhabitants.

    • Historical Growth: In 1950, only New York City was a megacity; by 2000 there were 19; in 2022 there are 44 megacities.

Urbanisation Trends

  • Globally: By 2050, 70% of the world’s population is predicted to live in cities, up from less than 30% in 1945.

  • Developing Countries: Higher rates of urbanisation with 93% of the increase expected in developing nations (80% in Asia and Africa).

  • Counter-Urbanisation: Has increased due to ease of commuting and the rise of remote working opportunities.

Page 2: Emergence of Megacities

Largest Cities

  • Top 10 Megacities (Population in millions):

    1. Tokyo, Japan: 37.4

    2. Delhi, India: 29.3

    3. Shanghai, China: 26.3

    4. Sao Paulo, Brazil: 21.8

    5. Mexico City, Mexico: 21.6

    6. Cairo, Egypt: 20.4

    7. Dhaka, Bangladesh: 20.2

    8. Mumbai, India: 20.1

    9. Beijing, China: 19.4

    10. Osaka, Japan: 19.2

  • Future Projections: By 2025-2030, around 630 million people expected to live in about 43 megacities.

Factors Affecting Urbanisation

Push Factors from Rural Areas

  • Social Factors:

    • Food insecurity due to agricultural issues.

    • Long journeys for services like schools and hospitals.

  • Economic Factors:

    • Insecurity in primary employment.

    • Lack of government investment in rural areas.

  • Environmental Factors:

    • Poor sanitation and clean water access; climate change effects.

Pull Factors to Urban Areas

  • Social Factors:

    • Diverse communities and safer environments for families.

  • Economic Factors:

    • Better-paying jobs, improved housing, economies of scale.

  • Environmental Factors:

    • High-density housing options and industrial job creation.

Page 3: Problems Associated with Rapid Urbanisation

Key Issues

1. Congestion

  • Overpopulation limits area resources, affecting living standards.

  • Case Example: Dharavi in Mumbai, which has a high population density and poor living conditions.

2. Transport

  • Infrastructure struggles to handle vehicle volume, leading to traffic congestion in cities like São Paulo.

3. Employment

  • High demand for jobs leads to reliance on informal sectors.

  • Child Labor Example: In Nepal, 42% of children aged 7-14 were involved in informal employment.

4. Crime

  • Higher rates of organized crime, social unrest, and lack of police funding.

5. Pollution

  • Poor waste management, high air pollution levels impacting health.

Page 4: Crime and Environmental Issues

Crime

  • Examples: Organised crimes (e.g., drug gangs in Rio de Janeiro) and high street crimes.

  • Contributing Factors:

    • Lack of funding for police services.

    • Inequality pushes individuals towards crime as an income source.

Environmental Challenges

  • Particulate Matter (PM): High levels in rapidly industrializing countries lead to health issues.

  • Water Pollution: Industrial waste contributes to disease spread due to inadequate sewage disposal and random waste burning.

Page 5: Social and Environmental Challenges

Key Concepts

Land Use

  • Different types: Residential, industrial, agricultural, recreational, and commercial.

Bid Rent Theory

  • Land values decrease with distance from the city core, guiding business and residential location decisions.

Burgess Model

  • Growth pattern of cities in concentric zones based on Chicago's development in the 1920s, with housing quality and social class increasing outward from the center.

Segregation

  • Tendency for individuals to live near others with similar socio-economic backgrounds.

Central Business District (CBD)

Characteristics

  1. Multi-story development due to high land values.

  2. High concentration of retail operations.

  3. High accessibility from public transport.

  4. Concentrated offices for service-related industries.

  5. Limited residential population due to high rents.

  6. Dynamic, frequently changing environments.

Page 6: Factors Affecting Land Use Patterns

Industrial Factors

  • Accessibility: Important for worker and customer access.

  • Land Values: Drives commercial and industrial placement in urban areas.

    • Example: High demand areas will typically have more expensive rents.

Residential Factors

  • Availability of land increases away from city centers, affecting house size and quality.

  • Transportation: Rail and road systems are essential for commuting.

  • Regeneration Projects: Increase land value while attracting wealthier residents (e.g., Ancoats, Manchester).

Page 7: Case Studies of Urban Challenges

Rio de Janeiro, Brazil (Developing Country)

  • Urban Challenges:

  1. Poor housing conditions in favelas.

  2. Informal economy with high inequality.

  3. Limited government support for housing and sanitation.

Environmental Issues

  • Traffic congestion and water pollution due to poor infrastructure and high population density.

Page 8: Urban Challenges in Manchester, UK (Developed Country)

Social Issues

  1. Food poverty in areas like Miles Platting.

  2. High reliance on food banks.

  3. Energy demand exceeding supply due to population increase.

Environmental Issues

  • Poor waste management leading to low recycling rates and air pollution.

  • Disparities in income affecting quality of life and access to services.

Page 9: Strategies for Sustainable Urban Management

Key Concepts

Sustainable City

  • Achieving needs of current inhabitants while minimizing ecological footprints.

Brownfield vs. Greenfield Sites

  • Brownfield sites have prior development; Greenfield sites are undeveloped land.

Advantages and Disadvantages of Development

Brownfield Sites

  • Advantages: Economic potential, visual improvements.

  • Disadvantages: Possible contamination from previous use.

Greenfield Sites

  • Advantages: Open spaces, environmental potential.

  • Disadvantages: May lead to urban sprawl and habitat loss.

Page 10: Sustainable Urban Living in Developed Countries

Key Strategies

Waste Management

  • Encouraging recycling through reduced bin capacity and electric disposal vehicles.

Transport

  • Development of public transport options which are cheaper than private alternatives, e.g., Electric buses in Manchester.

Health and Education

  • Investment in schools and initiatives like urban agriculture enhancing well-being.

Role of Stakeholders

  • Urban planners, local politicians, and property developers each play crucial roles in urban management and sustainability efforts.

Page 11: Sustainable Urban Strategies in Developing Countries

Primary Strategies

Waste and Transport Solutions

  • Recycling programs that economically support low-income families while improving city cleanliness.

  • Facilitating public transit systems like dedicated bus lanes in Curitiba.

Education and Employment

  • Ensuring high-quality green spaces and investing in educational initiatives for improved literacy rates.

Stakeholder Roles

  • Local government leaders and planning authorities play key roles in addressing urban challenges effectively.