AQA GCSE Geography (8035) — Challenges in the human environment
Every time a new factory opens or a hospital is built in a city, it acts as a magnet. For rural populations in Low-Income Countries (LICs) and Newly Emerging Economies (NEEs), cities like Lagos (Nigeria) and Rio de Janeiro (Brazil) offer a perceived escape from poverty. This rapid urban growth brings tremendous opportunities, but also unprecedented strain on infrastructure.
Urban growth triggers Industrial Development, which is the expansion of the manufacturing (secondary) sector. This process initiates the Multiplier Effect:
Cities also provide vital Social Opportunities, which directly improve quality of life. In Rio, the Santa Marta clinic, built on a steep hillside, has significantly reduced infant mortality. In Lagos, life expectancy is 62 years compared to just 54 years in rural Nigeria. Education is also far more accessible; 68% of Lagos residents have a secondary education, whereas 40% of rural Nigerians do not even complete primary school.
While cities generate immense wealth—Lagos contributes 30% of Nigeria's GDP with only 10% of the population—these opportunities are rarely accessible to all. This creates severe Urban Polarity, where extreme wealth and extreme poverty exist side-by-side.
To measure this inequality, geographers use the Gini Coefficient or income ratios:
In Nigeria, the wealth gap ratio for the top 1% compared to the bottom 50% is a staggering 1 to 37. We can see this polarity physically in the landscape. In Lagos, the elite Eko Atlantic project is being built while 60-66% of the city's 21 million residents live in unplanned slums. In Rio, wealthy residents in Barra de Tijuca enjoy a life expectancy of 80 years, while just miles away in the Cidade de Deus favela, life expectancy drops to 45–49 years.
When population growth outpaces the government's ability to build houses, people are forced into Squatter Settlements. According to the 2022 Census, 2.1 million people in Rio state live in favelas, with Rocinha being the largest (72,021 residents). In Lagos, slums like Makoko are built on stilts over the lagoon.
These settlements create severe sanitation challenges. In Makoko, up to 15 households share a single communal toilet, with sewage draining directly into the water. In Rio, 12% of people lack access to running water, and 37% of the city's water is lost through leaky pipes or illegal tapping. This lack of sanitation inevitably leads to deadly Waterborne Diseases.
Because formal employment cannot keep up with population growth, many residents are forced into the Informal Economy. In Lagos, 60% of the workforce operates in this untaxed, unregulated sector. This leads to high crime rates, with cities battling powerful gangs like Rio's Red Command or Lagos's "Area Boys."
The scale of urban pollution in LICs and NEEs is a major threat to public health. The challenges include:
To assess which challenges pose the greatest threat, we must look at how governments respond to achieve Urban Sustainability.
One approach is a Site and Service Scheme, such as Rio's $1 billion Favela-Bairro project. The government provided paved roads, water infrastructure, and cable cars, while residents improved their own homes. However, while it improved health, it caused rents to rise, displacing the poorest residents.
In Lagos, the Bus Rapid Transit (BRT) system successfully moves 200,000 people daily, cutting travel times by 30%. Ultimately, the greatest threat to these cities is the "vicious cycle" of poverty: lack of sanitation causes disease, which prevents people from working, keeping them trapped in poverty. Without sustainable infrastructure, the economic opportunities of the city will remain locked away from the urban poor.
Students often think everyone in an LIC/NEE city is poor. In reality, cities like Rio and Lagos exhibit extreme 'urban polarity', where wealthy gated communities sit right next to impoverished squatter settlements.
In 9-mark 'Evaluate' questions about urban opportunities, examiners expect a balanced judgement. Argue that the city creates wealth (multiplier effect) BUT counter this by explaining how this wealth is unevenly distributed.
When discussing environmental challenges, use specific quantitative data (e.g., Lagos's 40% waste collection rate or Rio's 200 tonnes of raw sewage daily) to elevate your answer above generic statements about 'pollution.'
To score high marks in 'Assess' questions regarding urban challenges, explicitly link problems together. For example, explain the 'vicious cycle' where poor sanitation leads to disease, which causes unemployment and deepens poverty.
Industrial Development
The growth of the manufacturing (secondary) sector, which often helps transition a country from a Low-Income Country (LIC) to a Newly Emerging Economy (NEE).
Multiplier Effect
A process where an initial investment (e.g., a new factory) leads to job creation, increased local spending, and higher tax revenues, sparking further economic growth.
Social Opportunities
Benefits that directly improve a person's quality of life, such as better access to health clinics, schools, or clean water.
Urban Polarity
The widening gap and physical separation between the extremely wealthy and the extremely poor within the same city.
Gini Coefficient
A statistical measure of income inequality where 0 represents perfect equality and 1 (or 100%) represents absolute inequality.
Squatter Settlements
Informal, often illegal housing built on land not owned by the residents, typically lacking basic services like clean water and electricity.
Waterborne Diseases
Illnesses such as cholera, dysentery, and typhoid that are transmitted through contaminated water or poor sanitation.
Informal Economy
Unregulated and untaxed employment, such as street vending or waste picking, which offers no legal contracts or benefits.
E-Waste
Discarded electronic waste (e.g., old phones and computers) that often leaks toxic heavy metals into the soil and groundwater.
Urban Sustainability
The practice of meeting today's urban needs without compromising the ability of future generations to meet their own needs.
Site and Service Scheme
An urban planning strategy where the government provides a plot of land with basic infrastructure (roads, water), and residents build the actual housing structures themselves.
Put your knowledge into practice — try past paper questions for Geography
Industrial Development
The growth of the manufacturing (secondary) sector, which often helps transition a country from a Low-Income Country (LIC) to a Newly Emerging Economy (NEE).
Multiplier Effect
A process where an initial investment (e.g., a new factory) leads to job creation, increased local spending, and higher tax revenues, sparking further economic growth.
Social Opportunities
Benefits that directly improve a person's quality of life, such as better access to health clinics, schools, or clean water.
Urban Polarity
The widening gap and physical separation between the extremely wealthy and the extremely poor within the same city.
Gini Coefficient
A statistical measure of income inequality where 0 represents perfect equality and 1 (or 100%) represents absolute inequality.
Squatter Settlements
Informal, often illegal housing built on land not owned by the residents, typically lacking basic services like clean water and electricity.
Waterborne Diseases
Illnesses such as cholera, dysentery, and typhoid that are transmitted through contaminated water or poor sanitation.
Informal Economy
Unregulated and untaxed employment, such as street vending or waste picking, which offers no legal contracts or benefits.
E-Waste
Discarded electronic waste (e.g., old phones and computers) that often leaks toxic heavy metals into the soil and groundwater.
Urban Sustainability
The practice of meeting today's urban needs without compromising the ability of future generations to meet their own needs.
Site and Service Scheme
An urban planning strategy where the government provides a plot of land with basic infrastructure (roads, water), and residents build the actual housing structures themselves.
