Study Session 5 Urbanisation: Trends, Causes and Effects
Introduction
More than half of the world’s population lives in urban areas. Due to the ongoing urbanisation and growth of the world’s population, there will be about 2.5 billion more people added to the urban population by 2050, mainly in Africa and Asia. The world’s urban areas are highly varied, but many cities and towns are facing problems such as a lack of jobs, homelessness and expanding squatter settlements, inadequate services and infrastructure, poor health and educational services and high levels of pollution.
In this study session, you will learn about the trends in urbanisation and the causes of urban growth. You will also learn about the demographic, health, environmental and social consequences of urbanisation.
Learning Outcomes for Study Session 5
When you have studied this session, you should be able to:
5.1 Define and use correctly all of the key words printed in bold. (SAQs 5.1 and 5.2)
5.2 Describe the global and local trends in urbanisation. (SAQ 5.3)
5.3 Explain the main causes of urban growth. (SAQs 5.1 and 5.2)
5.4 Describe the main positive and negative impacts of urbanisation. (SAQ 5.4)
5.1 Urbanisation trends
In Study Session 2 you learned about the overall trend in global population growth. Most of this increase is taking place in urban areas. Urbanisation is an increase in the number of people living in towns and cities. Urbanisation occurs mainly because people move from rural areas to urban areas and it results in growth in the size of the urban population and the extent of urban areas. These changes in population lead to other changes in land use, economic activity and culture. Historically, urbanisation has been associated with significant economic and social transformations. For example, urban living is linked with higher levels of literacy and education, better health, lower fertility and a longer life expectancy, greater access to social services and enhanced opportunities for cultural and political participation (UNDESA, 2014). However, urbanisation also has disadvantages caused by rapid and unplanned urban growth resulting in poor infrastructures such as inadequate housing, water and sanitation, transport and health care services.
5.1.1 Global trends in urbanisation
In 1960, the global urban population was 34% of the total; however, by 2014 the urban population accounted for 54% of the total and continues to grow. By 2050 the proportion living in urban areas is expected to reach 66% (UNDESA, 2014). Figure 5.1 shows the change in the rural and urban populations of the world from 1950 through to projected figures up to the year 2050.
Figure 5.1 Urban and rural population of the world, 1950–2050. (UNDESA, 2014)
From Figure 5.1, in which year did the number of people living in urban areas first exceed the number living in rural areas?
Reveal answer
The process of urbanisation affects all sizes of settlements, so villages gradually grow to become small towns, smaller towns become larger towns, and large towns become cities. This trend has led to the growth of mega-cities. A mega-city is an urban area of greater than ten million people. Rapid expansion of city borders, driven by increases in population and infrastructure development, leads to the expansion of city borders that spread out and swallow up neighbouring urban areas to form mega-cities. In 1970, there were only three mega-cities across the globe, but by the year 2000, the number had risen to 17 and by 2030, 24 more mega-cities will be added (see Figure 5.2).
Figure 5.2 The top mega-cities in the world in 1970, 2000 and 2030. (UNDESA, 2014)
From Figure 5.2, in Africa how many mega-cities are predicted to exist by 2030 and how many have already existed since the year 2000?
Reveal answer
The global trend in urbanisation is not the same in all parts of the world. Asia and Africa currently have the highest rates of urbanisation. Figure 5.3 shows a comparison of trends in more or less developed regions of the world.
Figure 5.3 Trends in urban population growth, comparing more and less developed regions. The graph shows the proportion of the total population living in urban areas.
In Figure 5.3, how would you describe the trends in urban growth in more and less developed regions during this century?
