Urbanization

Urbanization (or urbanisation) refers to the population shift from rural to urban areas, the corresponding decrease in the proportion of people living in rural areas, and the ways in which societies adapt to this change.^[1] It is predominantly the process by which towns and cities are formed and become larger as more people begin living and working in central areas.^[2]

Global urbanization map showing the percentage of urbanization and the biggest global population centres per country in 2018, based on UN estimates.

Guangzhou, a city of 14.5 million people, is one of the 8 adjacent metropolises located in the largest single agglomeration on earth, ringing the Pearl River Delta of China.

Mumbai is the most populous city in India, and the eighth most populous city in the world, with a total metropolitan area population of approximately 18.5 million.

Moscow, the capital and largest city of Russia, is the largest metropolitan area in Europe; with over 20 million residents in its metropolitan area.

Ho Chi Minh City is the largest city in Vietnam with a population in the Ho Chi Minh metropolitan area of over 21.2 million people.

Although the two concepts are sometimes used interchangeably, urbanization should be distinguished from urban growth. Urbanization refers to the proportion of the total national population living in areas classified as urban, whereas urban growth strictly refers to the absolute number of people living in those areas.^[3] It is predicted that by 2050 about 64% of the developing world and 86% of the developed world will be urbanized.^[4] That is equivalent to approximately 3 billion urbanites by 2050, much of which will occur in Africa and Asia.^[5] Notably, the United Nations has also recently projected that nearly all global population growth from 2017 to 2030 will be by cities, with about 1.1 billion new urbanites over the next 10 years.^[6]

Urbanization is relevant to a range of disciplines, including urban planning, geography, sociology, architecture, economics, education, statistics and public health. The phenomenon has been closely linked to modernization, industrialization, and the sociological process of rationalization.^[7] Urbanization can be seen as a specific condition at a set time (e.g. the proportion of total population or area in cities or towns), or as an increase in that condition over time. Therefore, urbanization can be quantified either in terms of the level of urban development relative to the overall population, or as the rate at which the urban proportion of the population is increasing. Urbanization creates enormous social, economic and environmental changes, which provide an opportunity for sustainability with the "potential to use resources more efficiently, to create more sustainable land use and to protect the biodiversity of natural ecosystems."^[5] Developing urban resilience and urban sustainability in the face of increased urbanization is at the center of international policy in Sustainable Development Goal 11 "Sustainable cities and communities."

Urbanization is not merely a modern phenomenon, but a rapid and historic transformation of human social roots on a global scale, whereby predominantly rural culture is being rapidly replaced by predominantly urban culture. The first major change in settlement patterns was the accumulation of hunter-gatherers into villages many thousands of years ago. Village culture is characterized by common bloodlines, intimate relationships, and communal behaviour, whereas urban culture is characterized by distant bloodlines, unfamiliar relations, and competitive behaviour. This unprecedented movement of people is forecast to continue and intensify during the next few decades, mushrooming cities to sizes unthinkable only a century ago. As a result, the world urban population growth curve has up till recently followed a quadratic-hyperbolic pattern.^[8]

History

 

Urbanization over the past 500 years^[9]

 

A global map illustrating the first onset and spread of urban centers around the world, based on.^[10]

From the development of the earliest cities in Indus valley civilization, Mesopotamia and Egypt until the 18th century, an equilibrium existed between the vast majority of the population who were engaged in subsistence agriculture in a rural context, and small centres of populations in the towns where economic activity consisted primarily of trade at markets and manufactures on a small scale. Due to the primitive and relatively stagnant state of agriculture throughout this period, the ratio of rural to urban population remained at a fixed equilibrium. However, a significant increase in the percentage of the global urban population can be traced in the 1st millennium BCE.^[11]

With the onset of the British agricultural and industrial revolution^[12] in the late 18th century, this relationship was finally broken and an unprecedented growth in urban population took place over the course of the 19th century, both through continued migration from the countryside and due to the tremendous demographic expansion that occurred at that time. In England and Wales, the proportion of the population living in cities with more than 20,000 people jumped from 17% in 1801 to 54% in 1891. Moreover, and adopting a broader definition of urbanization, while the urbanized population in England and Wales represented 72% of the total in 1891, for other countries the figure was 37% in France, 41% in Prussia and 28% in the United States.^[13]

As labourers were freed up from working the land due to higher agricultural productivity they converged on the new industrial cities like Manchester and Birmingham which were experiencing a boom in commerce, trade, and industry. Growing trade around the world also allowed cereals to be imported from North America and refrigerated meat from Australasia and South America. Spatially, cities also expanded due to the development of public transport systems, which facilitated commutes of longer distances to the city centre for the working class.

Urbanization rapidly spread across the Western world and, since the 1950s, it has begun to take hold in the developing world as well. At the turn of the 20th century, just 15% of the world population lived in cities.^[14] According to the UN, the year 2007 witnessed the turning point when more than 50% of the world population were living in cities, for the first time in human history.^[13]

Yale University in June 2016 published urbanization data from the time period 3700 BC to 2000 AD, the data was used to make a video showing the development of cities on the world during the time period.^[15][16][17] The origins and spread of urban centers around the world were also mapped by archaeologists.^[10]

Causes

 

Population age comparises between rural Pocahontas County, Iowa and urban Johnson County, Iowa, illustrating the flight of young adults (red) to urban centres in Iowa.^[18]

 

The City of Chicago, Illinois is an example of the early American grid system of development. The grid is enforced even on uneven topography.

Urbanization occurs either organically or planned as a result of individual, collective and state action. Living in a city can be culturally and economically beneficial since it can provide greater opportunities for access to the labour market, better education, housing, and safety conditions, and reduce the time and expense of commuting and transportation. Conditions like density, proximity, diversity, and marketplace competition are elements of an urban environment that deemed beneficial. However, there are also harmful social phenomena that arise: alienation, stress, increased cost of living, and mass marginalization that are connected to an urban way of living.^{[citation needed]} Suburbanization, which is happening in the cities of the largest developing countries, may be regarded as an attempt to balance these harmful aspects of urban life while still allowing access to the large extent of shared resources.^{[citation needed]}

In cities, money, services, wealth and opportunities are centralized. Many rural inhabitants come to the city to seek their fortune and alter their social position. Businesses, which provide jobs and exchange capital, are more concentrated in urban areas. Whether the source is trade or tourism, it is also through the ports or banking systems, commonly located in cities, that foreign money flows into a country.

Many people move into cities for economic opportunities, but this does not fully explain the very high recent urbanization rates in places like China and India. Rural flight is a contributing factor to urbanization. In rural areas, often on small family farms or collective farms in villages, it has historically been difficult to access manufactured goods, though the relative overall quality of life is very subjective, and may certainly surpass that of the city. Farm living has always been susceptible to unpredictable environmental conditions, and in times of drought, flood or pestilence, survival may become extremely problematic.

Thai farmers are seen as poor, stupid, and unhealthy. As young people flee the farms, the values and knowledge of rice farming and the countryside are fading, including the tradition of long kek, helping neighbours plant, harvest, or build a house. We are losing what we call Thai-ness, the values of being kind, helping each other, having mercy and gratefulness.

– Iam Thongdee, Professor of Humanities, Mahidol University in Bangkok^[19]

In a New York Times article concerning the acute migration away from farming in Thailand, life as a farmer was described as "hot and exhausting". "Everyone says the farmer works the hardest but gets the least amount of money". In an effort to counter this impression, the Agriculture Department of Thailand is seeking to promote the impression that farming is "honorable and secure".^[19]

However, in Thailand, urbanization has also resulted in massive increases in problems such as obesity. Shifting from a rural environment to an urbanized community also caused a transition to a diet that was mainly carbohydrate-based to a diet higher in fat and sugar, consequently causing a rise in obesity.^[20] City life, especially in modern urban slums of the developing world, is certainly hardly immune to pestilence or climatic disturbances such as floods, yet continues to strongly attract migrants. Examples of this were the 2011 Thailand floods and 2007 Jakarta flood. Urban areas are also far more prone to violence, drugs, and other urban social problems. In the United States, industrialization of agriculture has negatively affected the economy of small and middle-sized farms and strongly reduced the size of the rural labour market.

These are the costs of participating in the urban economy. Your increased income is canceled out by increased expenditure. In the end, you have even less left for food.

– Madhura Swaminathan, economist at Kolkata’s Indian Statistical Institute^[21]

Particularly in the developing world, conflict over land rights due to the effects of globalization has led to less politically powerful groups, such as farmers, losing or forfeiting their land, resulting in obligatory migration into cities. In China, where land acquisition measures are forceful, there has been far more extensive and rapid urbanization (54%) than in India (36%), where peasants form militant groups (e.g. Naxalites) to oppose such efforts. Obligatory and unplanned migration often results in the rapid growth of slums. This is also similar to areas of violent conflict, where people are driven off their land due to violence.

Cities offer a larger variety of services, including specialist services not found in rural areas. These services require workers, resulting in more numerous and varied job opportunities. Elderly people may be forced to move to cities where there are doctors and hospitals that can cater to their health needs. Varied and high-quality educational opportunities are another factor in urban migration, as well as the opportunity to join, develop, and seek out social communities.

Urbanization also creates opportunities for women that are not available in rural areas. This creates a gender-related transformation where women are engaged in paid employment and have access to education. This may cause fertility to decline. However, women are sometimes still at a disadvantage due to their unequal position in the labour market, their inability to secure assets independently from male relatives and exposure to violence.^[22]

People in cities are more productive than in rural areas. An important question is whether this is due to agglomeration effects or whether cities simply attract those who are more productive. Urban geographers have shown that there exists a large productivity gain due to locating in dense agglomerations.^[23] It is thus possible that agents^{[clarification needed]} locate in cities in order to benefit from these agglomeration effects.

Dominant conurbation

See also: List of largest cities throughout history and Primate city

The dominant conurbation(s) of a country can benefit to a greater extent from the same things cities offer, making them magnets for not just the non-urban population, but also urban and suburban population from other cities. Dominant conurbations are quite often primate cities, but do not have to be. For instance Greater Manila is rather a conurbation than a city: its 20 million overall population (over 20% national population) make it very much a primate city, but Quezon City (2.7 million), the largest municipality in Greater Manila, and Manila (1.6 million), the capital, are not. A conurbation's dominance can be measured by output, wealth, and especially population, each expressed as a percentage of an entire country. Greater Seoul is one conurbation with massive dominance over South Korea, it is home to 50% of the entire national population.^[24]

Though Greater Busan-Ulsan (15%, 8 million) and Greater Osaka (14%, 18 million) exhibit strong dominance in their respective countries, they are losing population to their even more dominant rivals, Seoul and Tokyo respectively.^[25]

Economic effects

 

A crowded BTS Station during the rush hour in Bangkok, Thailand

As cities develop, effects can include a dramatic increase and change in costs, often pricing the local working class out of the market, including such functionaries as employees of the local municipalities. For example, Eric Hobsbawm's book The age of revolution: 1789–1848 (published 1962 and 2005) chapter 11, stated "Urban development in our period was a gigantic process of class segregation, which pushed the new labouring poor into great morasses of misery outside the centres of government, business, and the newly specialized residential areas of the bourgeoisie. The almost universal European division into a 'good' west end and a 'poor' east end of large cities developed in this period." This is likely due to the prevailing south-west wind which carries coal smoke and other airborne pollutants downwind, making the western edges of towns preferable to the eastern ones.^[26]

Similar problems now affect the developing world, rising inequality resulting from rapid urbanization trends. The drive for rapid urban growth and often efficiency can lead to less equitable urban development. Think tanks such as the Overseas Development Institute have proposed policies that encourage labor-intensive growth as a means of absorbing the influx of low-skilled and unskilled labour.^[27] One problem these migrant workers are involved with is the growth of slums. In many cases, the rural-urban low skilled or unskilled migrant workers, attracted by economic opportunities in urban areas, cannot find a job and afford housing in cities and have to dwell in slums.^[28]

Urban problems, along with infrastructure developments, are also fuelling suburbanization trends in developing nations, though the trend for core cities in said nations tends to continue to become ever denser. Urbanization is often viewed as a negative trend, but there are positives in the reduction of expenses in commuting and transportation while improving opportunities for jobs, education, housing, and transportation. Living in cities permits individuals and families to take advantage of the opportunities of proximity and diversity.^{[29][30][31][32]} While cities have a greater variety of markets and goods than rural areas, infrastructure congestion, monopolization, high overhead costs, and the inconvenience of cross-town trips frequently combine to make marketplace competition harsher in cities than in rural areas.^{[citation needed]}

In many developing countries where economies are growing, the growth is often erratic and based on a small number of industries. For young people in these countries, barriers exist such as lack of access to financial services and business advisory services, difficulty in obtaining credit to start a business, and lack of entrepreneurial skills, in order for them to access opportunities in these industries. Investment in human capital so that young people have access to quality education and infrastructure to enable access to educational facilities is imperative to overcoming economic barriers.^[33]

Environmental effects

Furthermore, urbanization improves environmental eminence through superior facilities and standards in urban areas as compared to rural areas. Lastly, urbanization curbs pollution emissions by increasing innovations.^[34] In his book Whole Earth Discipline, Stewart Brand argues that the effects of urbanization are primarily positive for the environment. First, the birth rate of new urban dwellers falls immediately to replacement rate and keeps falling, reducing environmental stresses caused by population growth.^[35] Secondly, emigration from rural areas reduces destructive subsistence farming techniques, such as improperly implemented slash and burn agriculture. Alex Steffen also speaks of the environmental benefits of increasing the urbanization level in "Carbon Zero: Imagining Cities that can save the planet", .^[36]

However, existing infrastructure and city planning practices are not sustainable. In July 2013 a report issued by the United Nations Department of Economic and Social Affairs^[37] warned that with 2.4 billion more people by 2050, the amount of food produced will have to increase by 70%, straining food resources, especially in countries already facing food insecurity due to changing environmental conditions. The mix of changing environmental conditions and the growing population of urban regions, according to UN experts, will strain basic sanitation systems and health care, and potentially cause a humanitarian and environmental disaster.^[38]

Urban heat island

The existence of urban heat islands has become a growing concern over the years. An urban heat island is formed when industrial and urban areas produce and retain heat. Much of the solar energy that reaches rural areas is consumed by evaporation of water from vegetation and soil. In cities, where there are less vegetation and exposed soil, most of the sun's energy is instead absorbed by buildings and asphalt; leading to higher surface temperatures. Vehicles, factories, and industrial and domestic heating and cooling units release even more heat.^[39] As a result, cities are often 1 to 3 °C (1.8 to 5.4 °F) warmer than surrounding landscapes.^[40] Impacts also include reducing soil moisture and a reduction in reabsorption of carbon dioxide emissions.^[41]

Water quality

The occurrence of eutrophication in bodies of water is another effect large urban populations have on the environment. When rain occurs in these large cities, the rain filters down the pollutants such as CO₂ and other greenhouse gases in the air onto the ground below. Then, those chemicals are washed directly into rivers, streams, and oceans, causing a decline in water quality and damaging marine ecosystems.^[42]

Eutrophication is a process which causes hypoxic water conditions and algal blooms that may be detrimental to the survival of aquatic life.^[43] Harmful algal blooms, which produce dangerous toxins, thrive in eutrophic environments that are also rich in nitrogen and phosphorus.^[44] In these ideal conditions, they overtake surface water, making it difficult for other organisms to receive sunlight and nutrients. Overgrowth of algal blooms causes a decrease in overall water quality and disrupts the natural balance of aquatic ecosystems. Furthermore, as algal blooms die, CO₂ is produced, causing a more acidic environment, a process known as acidification.^[45]

The ocean's surface also has the ability to absorb CO₂ from the earth's atmosphere as emissions increase with the rise in urbanization. In fact, it is reported that the ocean absorbs a quarter of the CO₂ produced by humans.^[46] This has been useful to the environment by decreasing the harmful effects of greenhouse gases, but also further perpetuates acidification.^[47] Changes in pH inhibit the proper formation of calcium carbonate, a crucial component for many marine organisms to maintain shells or skeletons.^[48][46] This is especially true for many species of molluscs and coral. Regardless, some species have been able to instead adapt or thrive in a more acidic environment^[49]

Food waste

Rapid growth of communities create new challenges in the developed world and one such challenge is an increase in food waste^[50] also known as urban food waste.^[51][52][53] Food waste is the disposal of food products that can no longer be used due to unused products, expiration, or spoilage. The increase of food waste can raise environmental concerns such as increase production of methane gases and attraction of disease vectors.^[52][54] Landfills are the third leading cause of the release of methane,^[55] causing a concern on its impact to our ozone and on the health of individuals. Accumulation of food waste causes increased fermentation, which increases the risk of rodent and bug migration. An increase in migration of disease vectors creates greater potential of disease spreading to humans.^[56]

Waste management systems vary on all scales from global to local and can also be influenced by lifestyle. Waste management was not a primary concern until after the Industrial Revolution. As urban areas continued to grow along with the human population, proper management of solid waste became an apparent concern. To address these concerns, local governments sought solutions with the lowest economic impacts which meant implementing technical solutions at the very last stage of the process.^[57] Current waste management reflects these economically motivated solutions, such as incineration or unregulated landfills. Yet, a growing increase for addressing other areas of life cycle consumption has occurred from initial stage reduction to heat recovery and recycling of materials.^[57] For example, concerns for mass consumption and fast fashion have moved to the forefront of the urban consumers’ priorities. Aside from environmental concerns (e.g. climate change effects), other urban concerns for waste management are public health and land access.

Habitat fragmentation

Urbanization can have a large effect on biodiversity by causing a division of habitats and thereby alienation of species, a process known as habitat fragmentation.^[58] Habitat fragmentation does not destroy the habitat, as seen in habitat loss, but rather breaks it apart with things like roads and railways^[59] This change may affect a species ability to sustain life by separating it from the environment in which it is able to easily access food, and find areas that they may hide from predation^[60] With proper planning and management, fragmentation can be avoided by adding corridors that aid in the connection of areas and allow for easier movement around urbanized regions.^[61][62]

Depending on the various factors, such as level of urbanization, both increases or decreases in "species richness" can be seen.^[63][64] This means that urbanization may be detrimental to one species but also help facilitate the growth of others. In instances of housing and building development, many times vegetation is completely removed immediately in order to make it easier and less expensive for construction to occur, thereby obliterating any native species in that area. Habitat fragmentation can filter species with limited dispersal capacity. For example, aquatic insects are found to have lower species richness in urban landscapes.^[65] The more urbanized the surrounding of habitat is, the fewer species can reach the habitat.^[66] Other times, such as with birds, urbanization may allow for an increase in richness when organisms are able to adapt to the new environment. This can be seen in species that may find food while scavenging developed areas or vegetation that has been added after urbanization has occurred i.e. planted trees in city areas^[67]

Health and social effects

When cities don't plan for increases in population it drives up house and land prices, creating rich (ghettos) and poor ghettos. "You get a very unequal society and that inequality is manifested where people live, in our neighbourhoods, and it means there can be less capacity for empathy and less development for all society."

– Jack Finegan, Urban Programme Specialist at UN-Habitat^[68]

In the developing world, urbanization does not translate into a significant increase in life expectancy.^[69] Rapid urbanization has led to increased mortality from non-communicable diseases associated with lifestyle, including cancer and heart disease.^[70] Differences in mortality from contagious diseases vary depending on the particular disease and location.^[69]

Urban health levels are on average better in comparison to rural areas. However, residents in poor urban areas such as slums and informal settlements suffer "disproportionately from disease, injury, premature death, and the combination of ill-health and poverty entrenches disadvantage over time."^[22] Many of the urban poor have difficulty accessing health services due to their inability to pay for them; so they resort to less qualified and unregulated providers.^{[citation needed]}

While urbanization is associated with improvements in public hygiene, sanitation and access to health care, it also entails changes in occupational, dietary, and exercise patterns.^[70] It can have mixed effects on health patterns, alleviating some problems, and accentuating others.^[69]

Nutrition

One such effect is the formation of food deserts. Nearly 23.5 million people in the United States lack access to supermarkets within one mile of their home.^[71] Several studies suggest that long distances to a grocery store are associated with higher rates of obesity and other health disparities.^[72]

Food deserts in developed countries often correspond to areas with a high-density of fast food chains and convenience stores that offer little to no fresh food.^[73] Urbanization has been shown to be associated with the consumption of less fresh fruits, vegetables, and whole grains and a higher consumption of processed foods and sugar-sweetened beverages.^[72] Poor access to healthy food and high intakes of fat, sugar and salt are associated with a greater risk for obesity, diabetes and related chronic disease. Overall, body mass index and cholesterol levels increase sharply with national income and the degree of urbanization.[40]

Food deserts in the United States are most commonly found in low-income and predominately African American neighbourhoods.^[72] One study on food deserts in Denver, Colorado found that, in addition to minorities, the affected neighbourhoods also had a high proportion of children and new births.^[74] In children, urbanization is associated with a lower risk of under-nutrition but a higher risk of being overweight.^[69]

Asthma

Urbanization has also been associated with an increased risk of asthma as well. Throughout the world, as communities transition from rural to more urban societies, the number of people affected by asthma increases. The odds of reduced rates of hospitalization and death from asthmas has decreased for children and young adults in urbanized municipalities in Brazil. This finding indicates that urbanization may have a negative impact on population health particularly affecting people's susceptibility to asthma.^[75]

In low and middle income countries many factors contribute to the high numbers of people with asthma. Similar to areas in the United States with increasing urbanization, people living in growing cities in low income countries experience high exposure to air pollution, which increases the prevalence and severity of asthma among these populations.^[76] Links have been found between exposure to traffic-related air pollution and allergic diseases.^[77] Children living in poor, urban areas in the United States now have an increased risk of morbidity due to asthma in comparison to other low-income children in the United States.^[78] In addition, children with croup living in urban areas have higher hazard ratios for asthma than similar children living in rural areas. Researchers suggest that this difference in hazard ratios is due to the higher levels of air pollution and exposure to environmental allergens found in urban areas.^[79]

Exposure to elevated levels of ambient air pollutants such as nitrogen dioxide (NO₂), carbon monoxide (CO), and particulate matter with a diameter of less than 2.5 micrometers (PM_2.5), can cause DNA methylation of CpG sites in immune cells, which increases children's risk of developing asthma. Studies have shown a positive correlation between Foxp3 methylation and children's exposure to NO₂, CO, and PM_2.5. Furthermore, any amount of exposure to high levels of air pollution have shown long term effects on the Foxp3 region.^[80]

Despite the increase in access to health services that usually accompanies urbanization, the rise in population density negatively affects air quality ultimately mitigating the positive value of health resources as more children and young adults develop asthma due to high pollution rates.^[75] However, urban planning, as well as emission control, can lessen the effects of traffic-related air pollution on allergic diseases such as asthma.^[77]

Crime

Historically, crime and urbanization have gone hand in hand. The simplest explanation is that areas with a higher population density are surrounded by greater availability of goods. Committing crimes in urbanized areas is also more feasible. Modernization has led to more crime as well, as the modern media has raised greater awareness of the income gap between the rich and the poor. This leads to feelings of deprivation, which in turn can lead to crime. In some regions where urbanization happens in wealthier areas, a rise in property crime and a decrease in violent crime is seen.^[81]

Data shows that there is an increase in crime in urbanized areas. Some factors include per capita income, income inequality, and overall population size. There is also a smaller association between unemployment rate, police expenditures and crime.^[82] The presence of crime also has the ability to produce more crime. These areas have less social cohesion and therefore less social control. This is evident in the geographical regions that crime occurs in. As most crime tends to cluster in city centers, the further the distance from the center of the city, the lower the occurrence of crimes are.^[83]

Migration is also a factor that can increase crime in urbanized areas. People from one area are displaced and forced to move into an urbanized society. Here they are in a new environment with new norms and social values. This can lead to less social cohesion and more crime.^[84]

Physical activity

Although urbanization tends to produce more negative effects, one positive effect that urbanization has impacted is an increase in physical activity in comparison to rural areas. Residents of rural areas and communities in the United States have higher rates of obesity and engage in less physical activity than urban residents.^[85] Rural residents consume a higher percent of fat calories and are less likely to meet the guidelines for physical activity and more likely to be physically inactive.^[86][87] In comparison to regions within the United States, the west has the lowest prevalence of physical inactivity and the south has the highest prevalence of physical inactivity.^[87] Metropolitan and large urban areas across all regions have the highest prevalence of physical activity among residents.^[87]

Barriers such as geographic isolation, busy and unsafe roads, and social stigmas lead to decreased physical activity in rural environments.^[88] Faster speed limits on rural roads prohibits the ability to have bike lanes, sidewalks, footpaths, and shoulders along the side of the roads.^[85] Less developed open spaces in rural areas, like parks and trails, suggest that there is lower walkability in these areas in comparison to urban areas.^[85] Many residents in rural settings have to travel long distances to utilize exercise facilities, taking up too much time in the day and deterring residents from using recreational facilities to obtain physical activity.^[88] Additionally, residents of rural communities are traveling further for work, decreasing the amount of time that can be spent on leisure physical activity and significantly decreases the opportunity to partake in active transportation to work.^[85]

Neighbourhoods and communities with nearby fitness venues, a common feature of urbanization, have residents that partake in increased amounts of physical activity.^[88] Communities with sidewalks, street lights, and traffic signals have residents participating in more physical activity than communities without those features.^[85] Having a variety of destinations close to where people live, increases the use of active transportation, such as walking and biking.^[89] Active transportation is also enhanced in urban communities where there is easy access to public transportation due to residents walking or biking to transportation stops.^[89]

In a study comparing different regions in the United States, opinions across all areas were shared that environmental characteristics like access to sidewalks, safe roads, recreational facilities, and enjoyable scenery are positively associated with participation in leisure physical activity.^[87] Perceiving that resources are nearby for physical activity increases the likelihood that residents of all communities will meet the guidelines and recommendations for appropriate physical activity.^[89] Specific to rural residents, the safety of outdoor developed spaces and convenient availability to recreational facilities matters most when making decisions on increasing physical activity.^[86] In order to combat the levels of inactivity in rural residents, more convenient recreational features, such as the ones discussed in this paragraph, need to be implemented into rural communities and societies.^{[citation needed]}

Mental health

Urbanization factors that contribute to mental health can be thought of as factors that affect the individual and factors that affect the larger social group. At the macro, social group level, changes related to urbanization are thought to contribute to social disintegration and disorganization. These macro factors contribute to social disparities which affect individuals by creating perceived insecurity.^[90] Perceived insecurity can be due problems with the physical environment, such as issues with personal safety, or problems with the social environment, such as a loss of positive self-concepts from negative events.^[91] Increased stress is a common individual psychological stressor that accompanies urbanization and is thought to be due to perceived insecurity. Changes in social organization, a consequence of urbanization, are thought to lead to reduced social support, increased violence, and overcrowding. It is these factors that are thought to contribute to increased stress.^[92] It is important to note that urbanization or population density alone does not cause mental health problems. It is the combination of urbanization with physical and social risk factors that contribute to mental health problems. As cities continue to expand it is important to consider and account for mental health along with other public health measures that accompany urbanization.^{[citation needed]}

Changing forms

Different forms of urbanization can be classified depending on the style of architecture and planning methods as well as the historic growth of areas.

 

Map showing urban areas with at least one million inhabitants in 2006.

In cities of the developed world urbanization traditionally exhibited a concentration of human activities and settlements around the downtown area, the so-called in-migration. In-migration refers to migration from former colonies and similar places. The fact that many immigrants settle in impoverished city centres led to the notion of the "peripheralization of the core", which simply describes that people who used to be at the periphery of the former empires now live right in the centre.

Recent developments, such as inner-city redevelopment schemes, mean that new arrivals in cities no longer necessarily settle in the centre. In some developed regions, the reverse effect, originally called counter urbanization has occurred, with cities losing population to rural areas, and is particularly common for richer families. This has been possible because of improved communications and has been caused by factors such as the fear of crime and poor urban environments. It has contributed to the phenomenon of shrinking cities experienced by some parts of the industrialized world.

Rural migrants are attracted by the possibilities that cities can offer, but often settle in shanty towns and experience extreme poverty. The inability of countries to provide adequate housing for these rural migrants is related to overurbanization, a phenomenon in which the rate of urbanization grows more rapidly than the rate of economic development, leading to high unemployment and high demand for resources.^[93] In the 1980s, this was attempted to be tackled with the urban bias theory which was promoted by Michael Lipton.

Most of the urban poor in developing countries unable to find work can spend their lives in insecure, poorly paid jobs. According to research by the Overseas Development Institute pro-poor urbanization will require labour-intensive growth, supported by labour protection, flexible land use regulation and investments in basic services.'^[94]

Suburbanization

Main article: Suburbanization

When the residential area shifts outward, this is called suburbanization. A number of researchers and writers suggest that suburbanization has gone so far to form new points of concentration outside the downtown both in developed and developing countries such as India.^[95] This networked, poly-centric form of concentration is considered by some emerging pattern of urbanization. It is called variously edge city (Garreau, 1991), network city (Batten, 1995), postmodern city (Dear, 2000), or exurb, though the latter term now refers to a less dense area beyond the suburbs. Los Angeles is the best-known example of this type of urbanization. In the United States, this process has reversed as of 2011, with "re-urbanization" occurring as suburban flight due to chronically high transport costs.^[96]

...the most important class conflict in the poor countries of the world today is not between labour and capital. Nor is it between foreign and national interests. It is between rural classes and urban classes. The rural sector contains most of the poverty and most of the low-cost sources of potential advance; but the urban sector contains most of the articulateness, organization, and power. So the urban classes have been able to win most of the rounds of the struggle with the countryside...

– Michael Lipton, author of urban bias theory^[97]

Planned urbanization

Urbanization can be planned urbanization or organic. Planned urbanization, i.e.: planned community or the garden city movement, is based on an advance plan, which can be prepared for military, aesthetic, economic or urban design reasons. Examples can be seen in many ancient cities; although with exploration came the collision of nations, which meant that many invaded cities took on the desired planned characteristics of their occupiers. Many ancient organic cities experienced redevelopment for military and economic purposes, new roads carved through the cities, and new parcels of land were cordoned off serving various planned purposes giving cities distinctive geometric designs. UN agencies prefer to see urban infrastructure installed before urbanization occurs. Landscape planners are responsible for landscape infrastructure (public parks, sustainable urban drainage systems, greenways etc.) which can be planned before urbanization takes place, or afterwards to revitalize an area and create greater livability within a region. Concepts of control of the urban expansion are considered in the American Institute of Planners.

As population continues to grow and urbanize at unprecedented rates, new urbanism and smart growth techniques are implemented to create a transition into developing environmentally, economically, and socially sustainable cities. Additionally, a more well-rounded approach articulates the importance to promote participation of non-state actors, which could include businesses, research and non-profit organizations and, most importantly, local citizens.^[98] Smart Growth and New Urbanism's principles include walkability, mixed-use development, comfortable high-density design, land conservation, social equity, and economic diversity. Mixed-use communities work to fight gentrification with affordable housing to promote social equity, decrease automobile dependency to lower use of fossil fuels, and promote a localized economy. Walkable communities have a 38% higher average GDP per capita than less walkable urban metros (Leinberger, Lynch). By combining economic, environmental, and social sustainability, cities will become equitable, resilient, and more appealing than urban sprawl that overuses land, promotes automobile use, and segregates the population economically.^[99][100]

Urbanization throughout the world

Main article: Urbanization by sovereign state

 

Map with circled African and Asian belts of non-urbanized countries

Presently, most countries in the world are urbanized, with the global urbanization average numbering 56.2% in 2020.^[101] However, there are great differences between some regions; the nations of Europe, the Middle East and the Americas are predominantly urbanized. Meanwhile, two large belts (from central to eastern Africa, and from central to southeast Asia) of very lowly urbanized countries exist, as seen on the map here. These labeled countries are among the least urbanized.

As of 2020, urbanization rates are over 80% in the United States, Canada, Mexico, Brazil, Argentina, Chile, Japan, Australia, the United Kingdom, France, Spain and South Korea. South America is the most urbanized continent in the world, accounting for more than 80% of its total population living in urban areas. It is also the only continent where the urbanization rate is over 80%.

See also

•  Cities portal
•  World portal

• Back to the land
• City-state
• Counterurbanization
• Division of labour
• Exurb
• Ghetto
• Heterosociality
• Human population planning
• Human migration
• Megalopolis (city type)
• Political demography
• Pseudo-urbanization
• Urban ecology
• Urban exploration
• Urban history
• Urban metabolism
• Urban morphology
• Urban studies
• Urbanization by country
• White flight

Historical

• Neolithic Revolution
• Oppidum
• Polis
• Urban revolution

Regional

• Urbanization in Africa
• Urbanization in China
• Urbanization in India
• Urbanization in Pakistan
• Urbanization in the United States

References

1. "Urbanization". MeSH browser. National Library of Medicine. Retrieved 5 November 2014. The process whereby a society changes from a rural to an urban way of life. It refers also to the gradual increase in the proportion of people living in urban areas.
2. "Urbanization in". demographic partitions. Retrieved 8 July 2015.
3. Tacoli, Cecilia (2015). Urbanisation, rural-urban migration and urban poverty. McGranahan, Gordon, Satterthwaite, David. London: International Institute for Environment and Development. ISBN 9781784311377. OCLC 942419887.
4. "Urban life: Open-air computers". The Economist. 27 October 2012. Retrieved 20 March 2013.
5. "Urbanization". UNFPA – United Nations Population Fund.
6. Barney Cohen (2015). . Vol. 3, no. 2. Cornerstone, The Official Journal of the World Coal Industry. pp. 4–7. Archived from the original on 27 June 2015. Retrieved 26 June 2015.
7. Gries, T.; Grundmann, R. (2018). "Fertility and modernization: the role of urbanization in developing countries". Journal of International Development. 30 (3): 493–506. doi:10.1002/jid.3104.
8. Introduction to Social Macrodynamics: Secular Cycles and Millennial Trends. Moscow: URSS, 2006; Korotayev A. The World System urbanization dynamics. History & Mathematics: Historical Dynamics and Development of Complex Societies. Edited by Peter Turchin, Leonid Grinin, Andrey Korotayev, and Victor C. de Munck. Moscow: KomKniga, 2006. The World System urbanization dynamics. History & Mathematics: Historical Dynamics and Development of Complex Societies. Edited by Peter Turchin, Leonid Grinin, Andrey Korotayev, and Victor C. de Munck. Moscow: KomKniga, 2006. ISBN 5-484-01002-0. P. 44-62
9. "Urbanization over the past 500 years". Our World in Data. Retrieved 6 March 2020.
10. Stephens, Lucas; Fuller, Dorian; Boivin, Nicole; Rick, Torben; Gauthier, Nicolas; Kay, Andrea; Marwick, Ben; Armstrong, Chelsey Geralda; Barton, C. Michael (30 August 2019). "Archaeological assessment reveals Earth's early transformation through land use". Science. 365 (6456): 897–902. Bibcode:2019Sci...365..897S. doi:10.1126/science.aax1192. hdl:10150/634688. ISSN 0036-8075. PMID 31467217. S2CID 201674203.
11. Andrey Korotayev and Leonid Grini (2006). "The Urbanization and Political Development of the World System: A comparative quantitative analysis". In Peter Turchin; Leonid Grinin; Victor C. de Munck; and Andrey Korotayev (eds.). History & Mathematics: Historical Dynamics and Development of Complex Societies. Vol. 2. pp. 115–153.
12. "Industrial Revolution | Definition, History, Dates, Summary, & Facts". Encyclopedia Britannica. Retrieved 29 October 2020.
13. Christopher Watson (1993). K.B. Wildey; Wm H. Robinson (eds.). Trends in urbanisation. Proceedings of the First International Conference on Urban Pests. CiteSeerX 10.1.1.522.7409.
14. Annez, Patricia Clarke; Buckley, Robert M. (2009). "Urbanization and Growth: Setting the Context" (PDF). In Spence, Michael; Annez, Patricia Clarke; Buckley, Robert M. (eds.). Urbanization and Growth. ISBN 978-0-8213-7573-0.
15. Reba, Meredith; Reitsma, Femke; Seto, Karen C. (7 June 2016). "Spatializing 6,000 years of global urbanization from 3700 BC to AD 2000". Scientific Data. 3: 160034. Bibcode:2016NatSD...360034R. doi:10.1038/sdata.2016.34. ISSN 2052-4463. PMC 4896125. PMID 27271481.
16. "Research Data–Seto Lab". urban.yale.edu. Retrieved 9 July 2016.
17. "The History of Urbanization, 3700 BC – 2000 AD". YouTube. Archived from the original on 30 October 2021. Retrieved 24 September 2018.
18. based on 2000 U.S. Census Data
19. Fuller, Thomas (5 June 2012). "Thai Youth Seek a Fortune Away From the Farm". The New York Times. Retrieved 5 June 2012.
20. Jitnarin, Nattinee; Kosulwat, Vongsvat; Rojroongwasinkul, Nipa; Boonpraderm, Atitada; Haddock, Christopher K.; Poston, Walker S. C.; Jitnarin, Nattinee; Kosulwat, Vongsvat; Rojroongwasinkul, Nipa (21 January 2010). "Risk Factors for Overweight and Obesity among Thai Adults: Results of the National Thai Food Consumption Survey". Nutrients. 2 (1): 60–74. doi:10.3390/nu2010060. PMC 3257614. PMID 22253992.
21. "Early Death Assured in India Where 900 Million Go Hungry". Bloomberg. 13 June 2012. Retrieved 13 June 2012.
22. "Urbanization, gender and urban poverty:Paid work and unpaid carework in the city". UNFPA. 2012.
23. Borowiecki, Karol J. (2013). "Geographic Clustering and Productivity: An Instrumental Variable Approach for Classical Composers". Journal of Urban Economics. 73 (1): 94–110.
24. KOSIS, Korean Statistical Information Service.(in Korean)
25. Jacobs, A.J (2011). "Ulsan, South Korea: A Global and Nested 'Great' Industrial City" (PDF). The Open Urban Studies Journal. 4 (8–20): 8–20. doi:10.2174/1874942901104010008 – via core.ac.uk.
26. Benedictus, Leo (12 May 2017). "Blowing in the wind: why do so many cities have poor east ends?". The Guardian.
27. Grant, Ursula (2008) Opportunity and exploitation in urban labour markets 18 September 2012 at the Wayback Machine London: Overseas Development Institute
28. Todaro, Michael P. (1969). "A Model of Labor Migration and Urban Unemployment in Less Developed Countries". The American Economic Review. 59 (1): 148.
29. Glaeser, Edward (Spring 1998). "Are Cities Dying?". The Journal of Economic Perspectives. 12 (2): 139–60. doi:10.1257/jep.12.2.139.
30. Brand, Stewart. "Whole Earth Discipline – annotated extract". Retrieved 29 November 2009.
31. Nowak, J. (1997). "Neighborhood Initiative and the Regional Economy". Economic Development Quarterly. 11: 3–10. doi:10.1177/089124249701100101. S2CID 154678238.
32. Using the Gall-Peters Projection it is estimated that come 2015 the worlds urban population is set to exceed 4 billion, most of this growth is expected in Africa and Asia and China to be 50% urbanized.
33. "State of the World Population 2014". UNFPA. 2014.
34. Yasin, Iftikhar; Ahmad, Nawaz; Chaudhary, M. Aslam (22 July 2019). "Catechizing the Environmental-Impression of Urbanization, Financial Development, and Political Institutions: A Circumstance of Ecological Footprints in 110 Developed and Less-Developed Countries". Social Indicators Research. 147 (2): 621–649. doi:10.1007/s11205-019-02163-3. ISSN 0303-8300. S2CID 199855869.
35. Urbanization: An Environmental Force to Be Reckoned With
36. Carbon Zero: Imagining Cities that can save the planet by Alex Steffen
37. "World Economic and Social Survey (WESS) 2013" World Economic and Social Affairs. July 2013.
38. Auber, Tamar (17 July 2013) "Climate change and rapid urban expansion in Africa threaten children’s lives." 13 November 2014 at the Wayback Machine UNEARTH News. Retrieved 10 August 2013.
39. Park, H.-S. (1987). Variations in the urban heat island intensity affected by geographical environments. Environmental Research Center papers, no. 11. Ibaraki, Japan: Environmental Research Center, The University of Tsukuba.
40. "Heat Island Effect". Epa.gov (17 November 2010). Retrieved on 7 April 2014.
41. "Heating Up: Study Shows Rapid Urbanization in China Warming the Regional Climate Faster than Other Urban Areas".
42. Jiang, Leiwen; Hoepf Young, Malea; Hardee, Karen (2008). "Population, Urbanization, And The Environment". World Watch. 21 (5): 34–39.
43. "About Eutrophication | World Resources Institute". wri.org. 12 September 2013. Retrieved 18 November 2018.
44. "Harmful Algal Blooms". US Environmental Protection Administration. 3 June 2013. Retrieved 18 November 2018.
45. Ramesh, R; Lakshmi, A; Purvaja, R; Costanzo, S.D; Kelsey, R.H; Hawkey, J; Datta, A; Dennison, W.C (2013). "Eutrophication and Ocean Acidification" (PDF).
46. "National Climate Assessment". National Climate Assessment. Retrieved 18 November 2018.
47. Feely, Richard A.; Alin, Simone R.; Newton, Jan; Sabine, Christopher L.; Warner, Mark; Devol, Allan; Krembs, Christopher; Maloy, Carol (August 2010). "The combined effects of ocean acidification, mixing, and respiration on pH and carbonate saturation in an urbanized estuary". Estuarine, Coastal and Shelf Science. 88 (4): 442–449. Bibcode:2010ECSS...88..442F. doi:10.1016/j.ecss.2010.05.004. ISSN 0272-7714.
48. Fisheries, NOAA (9 September 2018). "Understanding Ocean Acidification | NOAA Fisheries". fisheries.noaa.gov. Retrieved 18 November 2018.
49. "Ocean Acidification". Smithsonian Ocean. Retrieved 18 November 2018.
50. Thyberg, Krista L.; Tonjes, David J. (2016). "Drivers of food waste and their implications for sustainable policy development". Resources, Conservation and Recycling. 106: 110–123. doi:10.1016/j.resconrec.2015.11.016. ISSN 0921-3449.
51. "Article: "Urban Food Waste generation: challenges and opportunities" Journal: Int. J. of Environment and Waste Management, 2009 Vol.3 No.1/2 pp.4 - 21 Abstract: Greater economic activity and a wider economic gap between rural and urban areas is leading to accelerated urbanisation and the generation of 35% more Urban Food Waste (UFW) from 2007 to 2025. Besides landfilling, this paper examines the advantages of introducing onsite composting and anaerobic digestion for the environmental recycling of UFW and the lowering of handling cost. For Asia and Africa, these solutions for UFW could reduce the mass of MSW by 43% and 55%, respectively, thus help there cities manage almost all of their MSW. For North America and Europe, such practice could reduce earth warming trends. - Inderscience Publishers - linking academia, business and industry through research". inderscience.com. Retrieved 7 October 2018.
52. Adhikari, Bijaya K.; Barrington, Suzelle; Martinez, José (October 2006). "Predicted growth of world urban food waste and methane production". Waste Management & Research. 24 (5): 421–433. doi:10.1177/0734242X06067767. ISSN 0734-242X. PMID 17121114. S2CID 34299202.
53. Adhikari, Bijaya K.; Barrington, Suzelle F.; Martinez, Jose (2009). "Urban Food Waste generation: challenges and opportunities" (PDF). International Journal of Environment and Waste Management. 3 (1/2): 4. doi:10.1504/ijewm.2009.024696. ISSN 1478-9876.
54. "Vector-borne diseases". World Health Organization. Retrieved 19 October 2018.
55. EPA,OA, US (23 December 2015). "Overview of Greenhouse Gases | US EPA". US EPA. Retrieved 16 October 2018.
56. Venkateswaran, Sandhya (1994). "Managing Waste: Ecological, Economic and Social Dimensions". Economic and Political Weekly. 29 (45/46): 2907–2911. JSTOR 4401996.
57. Bai, Xuemei; McPhearson, Timon; Cleugh, Helen; Nagendra, Harini; Tong, Xin; Zhu, Tong; Zhu, Yong-Guan (17 October 2017). "Linking Urbanization and the Environment: Conceptual and Empirical Advances". Annual Review of Environment and Resources. 42 (1): 215–240. doi:10.1146/annurev-environ-102016-061128. ISSN 1543-5938.
58. Elmqvist, Thomas; Zipperer, Wayne; Güneralp, Burak (2016). "10". Urbanization, habitat loss, biodiversity decline: solution pathways to break the cycle. pp. 139–151.
59. Liu Z, He C, Wu J (2016). "The Relationship between Habitat Loss and Fragmentation during Urbanization: An Empirical Evaluation from 16 World Cities". PLOS ONE. 11 (4): e0154613. Bibcode:2016PLoSO..1154613L. doi:10.1371/journal.pone.0154613. PMC 4849762. PMID 27124180.
60. Skagen, Susan K.; Yackel Adams, Amy A.; Adams, Rod D. (2005). "Nest Survival Relative to Patch Size in a Highly Fragmented Shortgrass Prairie Landscape". The Wilson Bulletin. 117: 23–34. doi:10.1676/04-038. S2CID 85173365.
61. Habitat Fragmentation and Wildlife Corridors
62. "Habitat fragmentation – Practical considerations". Forest Research. Retrieved 4 August 2022. Features such as footpaths, rivers and canals already offer green corridors in many urban areas. Greenspace that is not suitable breeding habitat for many species may still serve to improve permeability, and therefore movement, between breeding sites.
63. McKinney, Michael L. (29 January 2008). "Effects of urbanization on species richness: A review of plants and animals". Urban Ecosystems. 11 (2): 161–176. doi:10.1007/s11252-007-0045-4. ISSN 1083-8155. S2CID 23353943.
64. Sidemo-Holm, William; Ekroos, Johan; Reina García, Santiago; Söderström, Bo; Hedblom, Marcus (2022). "Urbanization causes biotic homogenization of woodland bird communities at multiple spatial scales". Global Change Biology: 1–13. doi:10.1111/gcb.16350.
65. Lundkvist, E.; Landin, J.; Karlsson, F. (2002). "Dispersing diving beetles (Dytiscidae) in agricultural and urban landscapes in south-eastern Sweden". Annales Zoologici Fennici.
66. Liao, W.; Venn, S.; Niemelä, J. (2020). "Environmental determinants of diving beetle assemblages (Coleoptera: Dytiscidae) in an urban landscape". Biodiversity and Conservation. 29 (7): 2343–2359. doi:10.1007/s10531-020-01977-9.
67. McKinney, Michael (October 2002). "Urbanization, Biodiversity, and Conservation". BioScience. 52 (10): 883. doi:10.1641/0006-3568(2002)052[0883:UBAC]2.0.CO;2.
68. "In crowded Hlaing Tharyar township, slums sit next to gated communites (sic) | Coconuts Yangon". 22 February 2016.
69. Eckert S, Kohler S (2014). "Urbanization and health in developing countries: a systematic review". World Health & Population. 15 (1): 7–20. doi:10.12927/whp.2014.23722. PMID 24702762.
70. Allender S, Foster C, Hutchinson L, Arambepola C (November 2008). "Quantification of urbanization in relation to chronic diseases in developing countries: a systematic review". Journal of Urban Health. 85 (6): 938–51. doi:10.1007/s11524-008-9325-4. PMC 2587653. PMID 18931915.
71. Block, Jason P.; Subramanian, S. V. (8 December 2015). "Moving Beyond "Food Deserts": Reorienting United States Policies to Reduce Disparities in Diet Quality". PLOS Medicine. 12 (12): e1001914. doi:10.1371/journal.pmed.1001914. ISSN 1549-1676. PMC 4672916. PMID 26645285.
72. Ghosh-Dastidar, Bonnie; Cohen, Deborah; Hunter, Gerald; Zenk, Shannon N.; Huang, Christina; Beckman, Robin; Dubowitz, Tamara (2014). "Distance to Store, Food Prices, and Obesity in Urban Food Deserts". American Journal of Preventive Medicine. 47 (5): 587–595. doi:10.1016/j.amepre.2014.07.005. PMC 4205193. PMID 25217097.
73. Cooksey-Stowers, Kristen; Schwartz, Marlene B.; Brownell, Kelly D. (14 November 2017). "Food Swamps Predict Obesity Rates Better Than Food Deserts in the United States". International Journal of Environmental Research and Public Health. 14 (11): 1366. doi:10.3390/ijerph14111366. PMC 5708005. PMID 29135909.
74. Stilley, Megan (2012). Urban food deserts: An exploration of northern neighbourhoods in Denver (Thesis). The University of Colorado at Denver. ProQuest 1013635534.
75. Ponte, Eduardo Vieira; Cruz, Alvaro A.; Athanazio, Rodrigo; Carvalho-Pinto, Regina; Fernandes, Frederico L. A.; Barreto, Mauricio L.; Stelmach, Rafael (1 February 2018). "Urbanization is associated with increased asthma morbidity and mortality in Brazil". The Clinical Respiratory Journal. 12 (2): 410–417. doi:10.1111/crj.12530. ISSN 1752-699X. PMID 27400674. S2CID 46804746.
76. Cruz, Álvaro A.; Stelmach, Rafael; Ponte, Eduardo V. (1 June 2017). "Asthma prevalence and severity in low-resource communities". Current Opinion in Allergy and Clinical Immunology. 17 (3): 188–193. doi:10.1097/aci.0000000000000360. ISSN 1528-4050. PMID 28333691. S2CID 6018699.
77. Carlsten, Christopher; Rider, Christopher F. (1 April 2017). "Traffic-related air pollution and allergic disease". Current Opinion in Allergy and Clinical Immunology. 17 (2): 85–89. doi:10.1097/aci.0000000000000351. ISSN 1528-4050. PMID 28141628. S2CID 38066984.
78. Keet, Corinne A.; Matsui, Elizabeth C.; McCormack, Meredith C.; Peng, Roger D. (September 2017). "Urban residence, neighborhood poverty, race/ethnicity, and asthma morbidity among children on Medicaid". Journal of Allergy and Clinical Immunology. 140 (3): 822–827. doi:10.1016/j.jaci.2017.01.036. PMC 8050806. PMID 28283418.
79. Lin, Sheng-Chieh; Lin, Hui-Wen; Chiang, Bor-Luen (1 September 2017). "Association of croup with asthma in children". Medicine. 96 (35): e7667. doi:10.1097/md.0000000000007667. ISSN 0025-7974. PMC 5585480. PMID 28858086.
80. Prunicki, Mary; Stell, Laurel; Dinakarpandian, Deendayal; de Planell-Saguer, Mariangels; Lucas, Richard W.; Hammond, S. Katharine; Balmes, John R.; Zhou, Xiaoying; Paglino, Tara (5 January 2018). "Exposure to NO2, CO, and PM2.5 is linked to regional DNA methylation differences in asthma". Clinical Epigenetics. 10: 2. doi:10.1186/s13148-017-0433-4. ISSN 1868-7083. PMC 5756438. PMID 29317916.
81. Shelley, L. I. (1981). Crime and modernization: The impact of industrialization and urbanization on crime. Carbondale: Southern Illinois University Press.
82. Gumus, E. (2004). Crime in urban areas: An empirical investigation.
83. Bruinsma, G. J. (2007). Urbanization and urban crime: Dutch geographical and environmental research. Crime and Justice, 35(1), 453-502.
84. Malik, A. A. (2016). Urbanization and Crime: A Relational Analysis. J. HUMAN. & Soc. Scl., 21, 68-69.
85. Umstattd Meyer, M. Renée; Moore, Justin B.; Abildso, Christiaan; Edwards, Michael B.; Gamble, Abigail; Baskin, Monica L. (2016). "Rural Active Living". Journal of Public Health Management and Practice. 22 (5): E11–E20. doi:10.1097/phh.0000000000000333. PMC 4775461. PMID 26327514.
86. Befort, Christie A.; Nazir, Niaman; Perri, Michael G. (1 September 2012). "Prevalence of Obesity Among Adults From Rural and Urban Areas of the United States: Findings From NHANES (2005-2008)". The Journal of Rural Health. 28 (4): 392–397. doi:10.1111/j.1748-0361.2012.00411.x. ISSN 1748-0361. PMC 3481194. PMID 23083085.
87. REIS, JARED P.; BOWLES, HEATHER R.; AINSWORTH, BARBARA E.; DUBOSE, KATRINA D.; SMITH, SHARON; LADITKA, JAMES N. (1 December 2004). "Nonoccupational Physical Activity by Degree of Urbanization and U.S. Geographic Region". Medicine & Science in Sports & Exercise. 36 (12): 2093–2098. doi:10.1249/01.mss.0000147589.98744.85. ISSN 0195-9131. PMID 15570145.
88. Seguin, Rebecca; Connor, Leah; Nelson, Miriam; LaCroix, Andrea; Eldridge, Galen (2014). "Understanding Barriers and Facilitators to Healthy Eating and Active Living in Rural Communities". Journal of Nutrition and Metabolism. 2014: 146502. doi:10.1155/2014/146502. ISSN 2090-0724. PMC 4276670. PMID 25574386.
89. Sallis, James F.; Floyd, Myron F.; Rodríguez, Daniel A.; Saelens, Brian E. (7 February 2012). "Role of Built Environments in Physical Activity, Obesity, and Cardiovascular Disease". Circulation. 125 (5): 729–737. doi:10.1161/circulationaha.110.969022. ISSN 0009-7322. PMC 3315587. PMID 22311885.
90. Luciano (2016). "Perceived insecurity, mental health and urbanization: Results from a multicentric study". International Journal of Social Psychiatry. 62 (6): 252–61. doi:10.1177/0020764016629694. PMID 26896027. S2CID 37122169.
91. Berry, Helen (6 December 2007). "'Crowded suburbs' and 'killer cities': a brief review of the relationship between urban environments and mental health". NSW Public Health Bulletin. 18 (12): 222–7. doi:10.1071/NB07024. PMID 18093463.
92. Srivastava, Kalpana (July 2009). "Urbanization and mental health". Industrial Psychiatry Journal. 18 (2): 75–6. doi:10.4103/0972-6748.64028. PMC 2996208. PMID 21180479.
93. Davis, Kingsley; Hertz Golden, Hilda (1954). "Urbanization and the Development of Pre-Industrial Areas". Economic Development and Cultural Change. 3 (1): 6–26. doi:10.1086/449673. S2CID 155010637.
94. (PDF). Overseas Development Institute. November 2008. Archived from the original (PDF) on 27 March 2009. Retrieved 12 January 2009.
95. Sridhar, K. S. (2007). "Density gradients and their determinants: Evidence from India". Regional Science and Urban Economics. 37 (3): 314–44. doi:10.1016/j.regsciurbeco.2006.11.001.
96. Bora, Madhusmita (1 July 2012). "Shifts in U.S. housing demand will likely lead to the re-urbanization of America". Nwitimes.com. Retrieved 20 March 2013.
97. Varshney, A. (ed.) 1993. "Beyond Urban Bias", p. 5. London: Frank Cass.
98. Lwasa, Seto, Shauib, Karen (27 November 2021). "Chapter 8 Urban Systems and other Settlements" (PDF). Retrieved 4 April 2022.
99. Christopher B. Leinberger; Patrick Lynch (2014). (PDF) (Report). The George Washington University School of Business. Archived from the original (PDF) on 24 September 2015. Retrieved 11 July 2015.
100. Lovelace, E.H. (1965). "Control of urban expansion: the Lincoln, Nebraska experience". Journal of the American Institute of Planners. 31:4 (4): 348–52. doi:10.1080/01944366508978191.
101. "UN: How has the world's urban population changed from 1950 to 2020?". World Economic Forum. Retrieved 31 October 2022.

Further reading

Main article: Urban history § Further reading

• Armus, Diego; Lear, John (1998). "The trajectory of Latin American urban history". Journal of Urban History. 24 (3): 291–301. doi:10.1177/009614429802400301. S2CID 144282123.
• Bairoch, Paul. Cities and economic development: from the dawn of history to the present (U of Chicago Press, 1991). online review
• Goldfield, David. ed. Encyclopedia of American Urban History (2 vol 2006); 1056pp; Excerpt and text search
• Hays, Samuel P (1993). "From the History of the City to the History of the Urbanized Society". Journal of Urban History. 19 (1): 3–25. doi:10.1177/009614429301900401. S2CID 144479930.
• Lees, Andrew. The city: A world history (New Oxford World History, 2015), 160pp.
• McShane, Clay. "The State of the Art in North American Urban History," Journal of Urban History (2006) 32#4 pp 582–597, identifies a loss of influence by such writers as Lewis Mumford, Robert Caro, and Sam Warner, a continuation of the emphasis on narrow, modern time periods, and a general decline in the importance of the field. Comments by Timothy Gilfoyle and Carl Abbott contest the latter conclusion.

External links

 

Wikimedia Commons has media related to Urbanization.

 

Wikiquote has quotations related to Urbanization.

• World Urbanization Prospects, the 2014 Revision, Website of the United Nations Population Division
• Urbanization in Bulgaria
• NASA Night Satellite Imagery – City lights can provide a simple, visual measure of urbanization
• Geopolis: research group, University of Paris-Diderot, France
• The Natural History of Urbanization, by Lewis Mumford
• The World System urbanization dynamics, by Andrey Korotayev
• Brief review of world socio-demographic trends includes a review of global urbanization trends
• World Economic and Social Survey 2013, United Nations Department of Economic and Social Affairs.