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Urbanisation is the physical growth of urban areas as a result of rural migration and even suburban concentration into cities, particularly the very large ones. The United Nations projected that half of the world's population would live in urban areas at the end of 2008. By 2050 it is predicted that 64.1% and 85.9% of the developing and developed world respectively will be urbanised.
Urbanisation is closely linked to modernisation, industrialisation, and the sociological process of rationalisation. Urbanisation can describe a specific condition at a set time, i.e. the proportion of total population or area in cities or towns, or the term can describe the increase of this proportion over time. So the term urbanisation can represent the level of urban relative to overall population, or it can represent the rate at which the urban proportion is increasing.
Urbanisation 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 last major change in settlement patterns was the accumulation of hunter-gatherers into villages many thousand years ago. Village culture is characterised by common bloodlines, intimate relationships, and communal behavior whereas urban culture is characterised by distant bloodlines, unfamiliar relations, and competitive behavior. This unprecedented movement of people is forecast to continue and intensify in the next few decades, mushrooming cities to sizes incomprehensible only a century ago. Indeed, today, in Asia the urban agglomerations of Dhaka, Karachi, Mumbai, Delhi, Manila, Seoul and Beijing are each already home to over 20 million people, while the Pearl River Delta, Shanghai-Suzhou and Tokyo are forecast to approach or exceed 40 million people each within the coming decade. Outside Asia, Mexico City, Sao Paulo, New York City, Lagos and Cairo are fast approaching or home to over 20 million people already.
As more and more people leave villages and farms to live in cities, urban growth results. The rapid growth of cities like Chicago in the late 19th century, Tokyo in the mid twentieth, and Mumbai in the 21st century can be attributed largely to rural-urban migration. This kind of growth is especially commonplace in developing countries. This phenomenal growth can also be attributed to the lure of not just economic opportunities, but also to loss or degradation of farmland and pastureland due to development, pollution, land grabs, or conflict, the attraction and anonymity of hedonistic pleasures of urban areas, proximity and ease of mass transport, as well as the opportunity to assert individualism.
The rapid urbanisation of the world’s population over the twentieth century is described in the 2005 Revision of the UN World Urbanization Prospects report. The global proportion of urban population rose dramatically from 13% (220 million) in 1900, to 29% (732 million) in 1950, to 49% (3.2 billion) in 2005. The same report projected that the figure is likely to rise to 60% (4.9 billion) by 2030.
According to the UN State of the World Population 2007 report, sometime in the middle of 2007, the majority of people worldwide will be living in towns or cities, for the first time in history; this is referred to as the arrival of the "Urban Millennium" or the 'tipping point'. In regard to future trends, it is estimated 93% of urban growth will occur in developing nations, with 80% of urban growth occurring in Asia and Africa.
Urbanisation rates vary between countries. The United States and United Kingdom have a far higher urbanisation level than China, India, Swaziland or Niger, but a far slower annual urbanisation rate, since much less of the population is living in a rural area. Some nations make a distinction between suburban and urban areas, while others do not, indeed, human conditions within such areas differ greatly.
- Urbanisation in the United States never reached the Rocky Mountains in locations such as Jackson Hole, Wyoming; Telluride, Colorado; Taos, New Mexico; Douglas County, Colorado and Aspen, Colorado. The state of Vermont has also been affected, as has the coast of Florida, the Birmingham-Jefferson County, AL area, the Pacific Northwest and the barrier islands of North Carolina.
- In the United Kingdom, two major examples of new urbanisation can be seen in Swindon, Wiltshire and Milton Keynes, Buckinghamshire. These two towns show some of the quickest growth rates in Europe.
Urbanisation occurs as individual, commercial, and governmental efforts to reduce time and expense in commuting and transportation while improving opportunities for jobs, education, housing, and transportation. Living in cities permits the advantages of the opportunities of proximity, diversity, and marketplace competition. However, the advantages of urbanisation are weighed against alienation issues, stress, increased daily life costs, and negative social aspects that result from mass marginalisation. Suburbanisation, which is happening in the cities of the largest developing countries, was sold and seen as an attempt to balance these negative aspects of urban life while still allowing access to the large extent of shared resources.
Cities are known to be places where money, services and wealth are centralised. Many rural inhabitants come to the city for reasons of seeking fortunes and social mobility. 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 that foreign money flows into a country, commonly located in cities.
Economic opportunities are just one reason people move into cities, though they do not go to fully explain why urbanisation rates have exploded only recently in places like China and India. Rural flight is a contributing factor to urbanisation. In rural areas, often on small family farms or collective farms in villages, it has traditionally been difficult to access manufactured goods, though 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.
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.”
However, in Thailand, urbanisation has also resulted in massive increases in problems such as obesity. City life, especially in modern urban slums of the developing world, are certainly hardly immune to pestilence nor climatic disturbances such as floods, yet continue 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 case of the United States, industrialisation of agriculture has negatively affected the economy of small and middle-sized farms and strongly reduced the size of the rural labor market.
Particularly in the developing world, conflict over land rights due to the effects of globalisation has led to less political 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 urbanisation (51%) than in India (29%), where peasants form militant groups (e.g. Naxalites) to oppose such efforts. Obligatory and unplanned migration often results in rapid growth of slums. This is also similar to areas of violent conflict, where people are driven off their land due to violence. Bogota, Colombia is one example of this.
Cities offer a larger variety of services, such as specialist services that aren't found in rural areas. Supporting the provision of these services requires workers, resulting in more numerous and varied job opportunities. Elderly individuals may be forced to move to cities where there are doctors and hospitals that can cater for 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.
Dominant cities 
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The dominant cities of a country also benefit from even more intense concentrations of the very same things cities offer. New York City has been growing in population the past few decades while Detroit and Philadelphia, old industrial cities of a similar age as New York, have shrunk dramatically. Similarly, Greater Tokyo, through its 20 year recession, has managed to outpace the growth of all other cities in Japan of a million people or more by its sheer concentration of economic, infrastructure, and people power.
Economic effects 
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 [1789–1848] was a gigantic process of class segregation, which pushed the new labouring poor into great morasses of misery outside the centres of government and business and the newly specialised 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 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. Similar problems now affect the developing world, rising inequality resulting from rapid urbanisation 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 even proposed policies that encourage labour intensive growth as a means of absorbing the influx of low skilled and unskilled labour. Urban problems, along with infrastructure developments, are also fueling suburbanisation trends in developing nations, though the trend for core cities in said nations tends to continue to become ever denser.
Urbanisation 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. While cities certainly have a larger variety of markets and goods than rural areas, infrastructure congestion, monopolisation, high overhead costs, and inconvenience of cross town trips team up to make marketplace competition as often as not worse in cities than in rural areas.
Environmental effects 
The phenomenon of Urban heat islands has become a growing concern. Incidence of this phenomenon as well as concern about it has increased over the years. An urban heat island is formed when industrial and urban areas are developed resulting in greater production and retention of heat. A large proportion of solar energy that affects rural areas is consumed evaporating water from vegetation and soil. In cities, where there is less vegetation and exposed soil, the majority of the sun’s energy is absorbed by urban structures and asphalt. Hence, during warm daylight hours, less evaporative cooling in cities results in higher surface temperatures than in rural areas. Vehicles and factories release additional city heat, as do industrial and domestic heating and cooling units. As a result, cities are often 2 to 10 °F (1 to 6 °C) warmer than surrounding landscapes. Impacts also include reducing soil moisture and a reduction in re-uptake of carbon dioxide emissions.
In his book Whole Earth Discipline, Stewart Brand argues that the effects of urbanisation are primarily positive for the environment. Firstly, the birth rate of new urban dwellers falls immediately to replacement rate, and keeps falling, reducing the risk of environmental stresses caused by population growth. Secondly, migration away from rural areas may reduce the prevalence of destructive subsistence farming techniques, such as improperly implemented slash and burn agriculture..
Changing forms 
Different forms of urbanisation can be classified depending on the style of architecture and planning methods as well as historic growth of areas.
In cities of the developed world urbanisation 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 "peripheralisation 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 urbanisation 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 industrialised world.
When the residential area shifts outward, this is called suburbanisation. A number of researchers and writers suggest that suburbanisation has gone so far to form new points of concentration outside the downtown both in developed and developing countries such as India. This networked, poly-centric form of concentration is considered by some an emerging pattern of urbanisation. It is called variously exurbia, edge city (Garreau, 1991), network city (Batten, 1995), or postmodern city (Dear, 2000). Los Angeles is the best-known example of this type of urbanisation. Interestingly, in the United States, this process has reversed as of 2011, with "re-urbanisation" occurring as suburban flight due to chronically high transport costs.
Rural migrants are attracted by the possibilities that cities can offer, but often settle in shanty towns and experience extreme poverty. In the 1980s, this was attempted to be tackled with the urban bias theory which was promoted by Michael Lipton who wrote: "...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, organisation and power. So the urban classes have been able to win most of the rounds of the struggle with the countryside...". Most of the urban poor in developing countries able to find work can spend their lives in insecure, poorly paid jobs. According to research by the Overseas Development Institute pro-poor urbanisation will require labour intensive growth, supported by labour protection, flexible land use regulation and investments in basic services.' 
Urbanisation can be planned urbanisation or organic. Planned urbanisation, 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 urbanisation occurs. Landscape planners are responsible for landscape infrastructure (public parks, sustainable urban drainage systems, greenways etc.) which can be planned before urbanisation takes place, or afterward to revitalise an area and create greater livability within a region. Concepts of control of the urban expansion are considered in the American Institute of Planners.
See also 
Contributors to urbanisation:
- "UN says half the world's population will live in urban areas by end of 2008". International Herald Tribune. Associated Press. February 26, 2008.
- "Urban life: Open-air computers". The Economist. 2012-10-27. Retrieved 2013-03-20.
- 6:19 PM ET (2012-11-21). "Li Keqiang Urges More Urbanization to Support China’s Growth". Bloomberg. Retrieved 2013-03-20.
- "World Urbanization Prospects: The 2005 Revision, Pop. Division, Department of Economic and Social Affairs, UN".
- "United Nations, Department of Economic and Social Affairs".
- "UN State of the World Population". UNFPA. 2007.
- Ankerl, Guy (1986). Urbanization Overspeed in Tropical Africa. INUPRESS, Geneva. ISBN 2-88155-000-2.
- "Population Bulletin 2007/2008" (Press release). Milton Keynes intelligence Observatory. 10/03/2008. Retrieved 11/06/2008.
- based on 2000 U.S. Census Data
- "Thai Youth Seek a Fortune Away From the Farm". New York Times. 2012-06-05. Retrieved 2012-06-05.
- "Early Death Assured In India Where 900 Million Go Hungry". Bloomberg. 2012-06-13. Retrieved 2012-06-13.
- Grant, Ursula (2008) Opportunity and exploitation in urban labour markets London: Overseas Development Institute
- Glaeser, Edward (Spring, 1998). "Are Cities Dying?". The Journal of Economic Perspectives 12 (2): 139–160. doi:10.1257/jep.12.2.139.
- Brand, Stewart. "Whole Earth Discipline - annotated extract". Retrieved 2009-11-29.
- Nowak, Jeremy. "Neighborhood Iniative and the Regional Economy," Economic Development Quarterly, Vol. 11, No. 1, February 1997, pp. 3-10.
- "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% urbanised"
- 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.
- "Heat Island Effect"
- "Heating Up: Study Shows Rapid Urbanisation in China Warming the Regional Climate Faster than Other Urban Areas".
- Sridhar, K. (37 (3) 2007 314:344). "Density gradients and their determinants: Evidence from India". Regional Science and Urban Economics.[dead link]
- Bora, Madhusmita (2012-07-01). "Shifts in U.S. housing demand will likely lead to the re-urbanization of America". Nwitimes.com. Retrieved 2013-03-20.
- Varshney, A. (ed.) 1993. "Beyond Urban Bias", p.5. London: Frank Cass.
- "Opportunity and exploitation in urban labour markets". Overseas Development Institute. November 2008.
- Lovelace, E.H. (1965). "Control of urban expansion: the Lincoln, Nebraska experience". Journal of the American Institute of Planners 31:4: 348–352.
|Wikimedia Commons has media related to: Urbanization|
- World Urbanisation Prospects, the 2011 Revision, Website of the United Nations Population Division
- Geopolis: research group, University of Paris-Diderot, France
- Tomorrow's Crises Today - the humanitarian dimension of urbanisation, by IRIN
- The Natural History of Urbanisation, by Lewis Mumford
- The World System urbanisation dynamics, by Andrey Korotayev
- Brief review of world socio-demographic trends includes review of global urbanisation trends
- Thai youth seek fortune away from farm. NYT