urbanization
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What is urbanization?
Urbanization is the process where large numbers of people become permanently concentrated in relatively small areas, forming cities. The definition of what constitutes a city varies across time and place, usually explained through demographics. The United Nations follows each country's definitions, which differ considerably. The urban revolution occurred independently in many places and times, first in Mesopotamia, in ancient Sumer, as early as 5000 bp.
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Why do people move from rural areas to cities?
People move from rural to urban areas for various reasons, primarily seeking better economic opportunities, healthcare, and education. Cities serve as hubs for trade, manufacturing, and innovation, offering a wider array of jobs and career paths.
The concentration of industries and businesses in urban areas creates a dynamic environment that attracts individuals seeking advancement. Rural areas often lack these opportunities, leading to a rural exodus, especially in countries like Peru. This migration contributes to urbanization, sometimes resulting in challenges such as slums and overcrowded settlements. Despite these issues, many people find that the benefits of urban living outweigh the drawbacks.
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What are some effects of urbanization on cities?
Urbanization can bring both positive and negative effects to cities. On one hand, the construction of infrastructure creates employment opportunities and brings revenue to local governments through taxes. Urban centers can also be hubs for specialized service activity and cultural innovation.
However, urbanization can strain environmental resources, shift economic burdens to long-time residents, and increase transportation and energy costs. It can also destroy wildlife habitats and increase the risk of flooding and water pollution. Additionally, the concentration of the labor force can undermine traditional social structures, and local institutions may struggle to cope with the effects of poverty and disrupted family life.
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How does urbanization affect the environment?
Urbanization significantly impacts the environment through altered landscapes and concentrated pollution. Constructing buildings and infrastructure leads to habitat destruction, forcing wildlife to relocate or struggle to survive. Urban areas often experience modified weather patterns, including altered wind flow, increased temperatures, and changes in precipitation. Higher concentrations of pollutants from industry, fuel combustion, and waste contribute to air and water pollution, affecting temperature, visibility, and precipitation. Increased runoff from impermeable surfaces elevates flood risks and carries pollutants into water systems, harming aquatic life. Urban sprawl increases energy consumption and reliance on automobiles, further contributing to air pollution and global warming.
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What challenges can rapid urbanization create for governments?
Rapid urbanization presents several challenges for governments. The quick population growth requires more resources like food, water, energy, and housing. This can lead to overcrowded areas and strain resources, especially when growth is faster than 1% annually.
Additionally, urban sprawl, driven by the desire for more space and car use, leads to increased energy use, pollution, and traffic. Governments also face issues providing low-cost housing and managing building materials. They must address substandard housing, particularly in urban peripheries, and ensure access to basic services.
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How can cities plan for sustainable urbanization?
To plan for sustainable urbanization, cities can adopt strategies that address environmental, economic, and social needs. This involves increasing housing opportunities, creating pedestrian-friendly communities, and encouraging citizen participation in decision-making. Integrating various land-use types, preserving open spaces, and increasing transportation choices are also key. Transit villages, with residential and commercial areas built around mass transit networks, can reduce reliance on cars. Urban growth boundaries can separate urban areas from open spaces. Prioritizing public transit can lead to air quality improvements, less land consumption and lower energy requirements. Future cities will likely be denser, with mixed land use, urban agriculture, and reduced freeways, emphasizing walking, cycling, and transit.
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urbanization, the process by which large numbers of people become permanently concentrated in relatively small areas, forming cities.
The definition of what constitutes a city changes from time to time and place to place, but it is most usual to explain the term as a matter of demographics. The United Nations does not have its own definition of “urban” but instead follows the definitions used in each country, which may vary considerably. The United States, for instance, uses “urban place” to mean any locality where more than 2,500 people live. In Peru the term is applied to population centres with 100 or more dwellings.
History
Whatever the numerical definition, it is clear that the course of human history has been marked by a process of accelerated urbanization. It was not until the Neolithic Period, beginning at roughly 10,000 bce, that humans were able to form small permanent settlements. Cities of more than 100,000 did not exist until the time of Classical antiquity, and even those did not become common until the sustained population explosion of the last three centuries. In 1800 less than 3 percent of the world’s population was living in cities of 20,000 or more; this had increased to about one-quarter of the population by the mid-1960s. By the early 21st century more than half of the world’s population resided in urban centres.
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The little towns of ancient civilizations, both in the Old World and the New, were only possible because of improvements in agriculture and transportation. As farming became more productive, it produced a surplus of food. The development of means of transportation, dating from the invention of the wheel about 3500 bce, made it possible for the surplus from the countryside to feed urban populations, a system that continues to the present day.
Despite the small size of these villages, the people in early towns lived quite close together. Distances could be no greater than an easy walk, and nobody could live out of the range of the water supply. In addition, because cities were constantly subject to attack, they were quite often walled, and it was difficult to extend barricades over a large area. Archaeological excavations have suggested that the population density in the cities of 2000 bce may have been as much as 128,000 per square mile (49,400 per square km). By contrast, the present cities of Kolkata and Shanghai, with densities of more than 70,000 per square mile, are regarded as extremes of overcrowding.
With few exceptions, the elite—aristocrats, government officials, clergy, and the wealthy—lived in the centre of ancient cities, which was usually located near the most important temple. Farther out were the poor, who were sometimes displaced beyond the city walls altogether.
The greatest city of antiquity was Rome, which at its height in the 3rd century ce covered almost 4 square miles (10 square km) and had at least 800,000 inhabitants. To provide for this enormous population, the empire constructed a system of aqueducts that channeled drinking water from hills as far away as 44 miles (70 km). Inside the city itself, the water was pumped to individual homes through a remarkable network of conduits and lead pipes, the equal of which was not seen until the 20th century. As in most early cities, Roman housing was initially built from dried clay molded about wooden frameworks. As the city grew, it began to include structures made from mud, brick, concrete, and, eventually, finely carved marble.
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