Urbanization (or urbanisation) is the increase in the population of cities in proportion to the region's rural population. Urbanization is studied in terms of its effects on the ecology and economy of a region, while the discipline of urban sociology studies political, psychological and anthropological changes to human society that occur in an urban environment (urban-city).

Urbanization Today
The 2005 Revision of the UN World Urbanization Prospects report described the 20th century as witnessing "the rapid urbanization of the world’s population", as 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.[1]

Urbanization rates vary across the world. The United States and United Kingdom have a far higher urbanization level than China, India, Swaziland or Niger, but a far slower annual urbanization rate, since much less of the population is living in a rural area.

    * Urbanization in the United States has affected the Rocky Mountains in locations such as Jackson Hole, Wyoming, Telluride, Colorado, Taos, New Mexico, Douglas County, Colorado and Aspen, Colorado. The lake district of northern Minnesota has also been affected as has Vermont, the coast of Florida, the Birmingham-Jefferson County, AL area, and the barrier islands of North Carolina.
    * In the United Kingdom, two major examples of new urbanization can be seen in Swindon, Wiltshire and Milton Keynes, Buckinghamshire. These two towns show some of the quickest growth rates in Europe.

[edit] Urbanization Projections

According to the UN-HABITAT 2006 Annual 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". In regard to future trends, it is estimated 93% of urban growth will occur in Asia and Africa, and to a lesser extent in Latin America and the Caribbean. By 2050 over 6 billion people, two thirds of humanity, will be living in towns and cities.