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Under the recommendation of the Seventh Central Pay Commission, the CCA classification was abolished in 2008. The earlier HRA classification of cities was changed from A-1 to X; A, B-1, and B-2 to Y; and C and unclassified cities to Z. [2] [3] [4] X, Y, and Z are more commonly known as Tier-1, Tier-2, and Tier-3 cities, respectively.
Urbanization has a great impact on biodiversity. As cities develop, vital habitats are destroyed or fragmented into patches which leads to them not being big enough to support complex ecological communities. In cities, species can become endangered or locally extinct. The human population is the main contributor to the expansion of urban areas.
The urban hierarchy ranks each city based on the size of population residing within the nationally defined statistical urban area. Because urban population depends on how governments define their metropolitan areas, urban hierarchies are conventionally ranked at the national level; however, the ranking can be extended globally to include all cities.
(In modern times, city status is awarded for secular reasons but without reference to size.) Thus, some cathedral cities in England (e.g., Ely, Cambridgeshire) have a much smaller populations than some towns (e.g., Luton). In some parts of the United States, the distinction between town and city is a matter of a decision by local government to ...
City region is a term used by urbanists, economists and urban planners to refer to how one or more core cities are linked to a hinterland by functional ties, such as economic, housing-market, commuting, marketing or retail catchment factors. [1]
In the decade of 1991–2001, migration to major cities caused rapid increase in urban population. [7] [8] The number of Indians living in urban areas has grown by 31.2% between 1991 and 2001. [9] Yet, in 2001, over 70% lived in rural areas.
Urban ecology is a relatively new field. Because of this, the research that has been done in this field has yet to become extensive. While there is still plenty of time for growth in the research of this field, there are some key issues and biases within the current research that still need to be addressed.
Visakhapatnam, Kakinada, and Tirupati are being developed as smart cities by Government of India under Smart Cities Mission. [5] [6] In 2021 Mangalagiri and Tadepalli Municipalities and villages in mandals were merged to form Mangalagiri-Tadepalli. [7] The cities written in bold are the headquarters of their respective district.