Australia

In local government, a city hall, town hall, civic centre (in the UK or Australia), guildhall, or municipal hall (in the Philippines) is the chief administrative building of a city, town, or other municipality. It usually houses the city or town council and at least some other arms of the local government. It also often functions as the office of the mayor (or other executive), if the relevant municipality has such an officer. In large cities, the local government is often administratively expansive, and the city hall may bear more resemblance to a municipal capitol building.

By convention, until the middle of the 19th century, a single large open chamber (or "hall") formed an integral part of the building housing the council and such other organs of government as supported it. The hall may be used for council meetings and other significant events. This large chamber, the "town hall" (and its later variant "city hall") became synonymous with the whole building, and, synecdochically, the municipal government headquartered there. The terms "council chambers", "municipal building" or variants may be used locally in preference to "town hall" if no such large hall is present within the building.

Water pollution (or aquatic pollution) is the contamination of water bodies, with a negative impact on their uses. It is usually a result of human activities. Water bodies include lakes, rivers, oceans, aquifers, reservoirs and groundwater. Water pollution results when contaminants mix with these water bodies. Contaminants can come from one of four main sources. These are sewage discharges, industrial activities, agricultural activities, and urban runoff including stormwater. Water pollution may affect either surface water or groundwater. This form of pollution can lead to many problems. One is the degradation of aquatic ecosystems. Another is spreading water-borne diseases when people use polluted water for drinking or irrigation. Water pollution also reduces the ecosystem services such as drinking water provided by the water resource.

Sources of water pollution are either point sources or non-point sources. Point sources have one identifiable cause, such as a storm drain, a wastewater treatment plant, or an oil spill. Non-point sources are more diffuse. An example is agricultural runoff. Pollution is the result of the cumulative effect over time. Pollution may take many forms. One would is toxic substances such as oil, metals, plastics, pesticides, persistent organic pollutants, and industrial waste products. Another is stressful conditions such as changes of pH, hypoxia or anoxia, increased temperatures, excessive turbidity, or changes of salinity). The introduction of pathogenic organisms is another. Contaminants may include organic and inorganic substances. A common cause of thermal pollution is the use of water as a coolant by power plants and industrial manufacturers.

There are eight capital cities in Australia, each of which functions as the seat of government for the state or territory in which it is located. One of these, Canberra, is also the national capital. Section 125 of the Constitution of Australia specified that the seat of the national government, that is, the national capital, would be in its own territory within New South Wales, at least 100 miles (161 km) from Sydney. The Constitution specified that until this national capital was ready, the Parliament would sit in Melbourne. In 1927, the national capital was finally ready and the national government relocated from its former seat in Melbourne to Canberra within the Australian Capital Territory (or the Federal Capital Territory as it was known at the time).

In each state and internal territory, the capital is also the jurisdiction's most populous city. The Australian external territory of Norfolk Island has its official capital at Kingston, although this acts merely as the administrative centre of government; its de facto capital is Burnt Pine.

South Australia (commonly abbreviated as SA) is a state in the southern central part of Australia. With a total land area of 984,310 square kilometres (380,044 sq mi), it is the fourth-largest of Australia's states and territories by area, which includes some of the most arid parts of the continent, and with 1.5 million people, it is the fifth-largest of the states and territories by population. This population is the second-most highly centralized in the nation after Western Australia, with more than 67% of South Australians living in the capital Adelaide or its environs. Other population centres in the state are relatively small; Mount Gambier, the second-largest centre, has a population of 26,878.

South Australia shares borders with all the other mainland states. It is bordered to the west by Western Australia, to the north by the Northern Territory, to the north-east by Queensland, to the east by New South Wales, and to the south-east by Victoria. To the south, its border is the ocean, the Great Australian Bight.

These lists of Australian cities by population provide rankings of Australian cities and towns according to various systems defined by the Australian Bureau of Statistics (ABS).

The eight Greater Capital City Statistical Areas (GCCSAs) are listed for the state and territorial capital cities. All Significant Urban Areas (SUAs) over 50,000 people are listed next followed by the 50 largest urban centres by population. Lastly, the 50 largest local government areas (the third tier of government below the states and territories) are also ranked.

Gulf St Vincent, sometimes referred to as St Vincent Gulf, St Vincent's Gulf or Gulf of St Vincent, is the eastern of two large inlets of water on the southern coast of Australia, in the state of South Australia, the other being the larger Spencer Gulf, from which it is separated by Yorke Peninsula. On its eastern side the gulf is bordered by the Adelaide Plains and the Fleurieu Peninsula.

Australian English (AusE, AusEng, AuE, AuEng, en-AU) is the set of varieties of the English language native to Australia. It is the country's common language and de facto national language. While Australia has no official language, English is the first language of the majority of the population, and has been entrenched as the de facto national language since the onset of British settlement, being the only language spoken in the home for 72% of Australians in 2021. It is also the main language used in compulsory education, as well as federal, state and territorial legislatures and courts.

Australian English began to diverge from British and Hiberno-English after the First Fleet established the Colony of New South Wales in 1788. Australian English arose from a dialectal melting pot created by the intermingling of early settlers who were from a variety of dialectal regions of Great Britain and Ireland, though its most significant influences were the dialects of South East England. By the 1820s, the native-born colonists' speech was recognisably distinct from speakers in Britain and Ireland.

Global North and Global South are terms that denote a method of grouping countries based on their defining characteristics with regard to socioeconomics and politics. According to UN Trade and Development (UNCTAD), the Global South broadly comprises Africa, Latin America and the Caribbean, Asia (excluding Israel, Japan, and South Korea), and Oceania (excluding Australia and New Zealand). Most of the Global South's countries are commonly identified as lacking in their standard of living, which includes having lower incomes, high levels of poverty, high population growth rates, inadequate housing, limited educational opportunities, and deficient health systems, among other issues. Additionally, these countries' cities are characterized by their poor infrastructure. Opposite to the Global South is the Global North, which the UNCTAD describes as broadly comprising Northern America and Europe, Israel, Japan, South Korea, Australia, and New Zealand. Consequently the two groups do not correspond to the Northern Hemisphere or the Southern Hemisphere, as many of the Global South's countries are geographically located in the north and vice-versa.

More specifically, the Global North consists of the world's developed countries, whereas the Global South consists of the world's developing countries and least developed countries. The Global South classification, as used by governmental and developmental organizations, was first introduced as a more open and value-free alternative to Third World, and likewise potentially "valuing" terms such as developed and developing. Countries of the Global South have also been described as being newly industrialized or in the process of industrializing. Many of them are current or former subjects of colonialism.

The natural environment or natural world encompasses all biotic and abiotic things occurring naturally, meaning in this case not artificial. The term is most often applied to Earth or some parts of Earth. This environment encompasses the interaction of all living species, climate, weather and natural resources that affect human survival and economic activity.The concept of the natural environment can be distinguished as components:

• Complete ecological units that function as natural systems without massive civilized human intervention, including all vegetation, microorganisms, soil, rocks, plateaus, mountains, the atmosphere and natural phenomena that occur within their boundaries and their nature.
• Universal natural resources and physical phenomena that lack clear-cut boundaries, such as air, water and climate, as well as energy, radiation, electric charge and magnetism, not originating from civilized human actions.

In contrast to the natural environment is the built environment. Built environments are where humans have fundamentally transformed landscapes such as urban settings and agricultural land conversion, the natural environment is greatly changed into a simplified human environment. Even acts which seem less extreme, such as building a mud hut or a photovoltaic system in the desert, the modified environment becomes an artificial one. Though many animals build things to provide a better environment for themselves, they are not human, hence beaver dams and the works of mound-building termites are thought of as natural.

Overgrazing occurs when plants are exposed to intensive grazing for extended periods of time, or without sufficient recovery periods. It can be caused by either livestock in poorly managed agricultural applications, game reserves, or nature reserves. It can also be caused by immobile, travel restricted populations of native or non-native wild animals.

Overgrazing reduces the usefulness, productivity and biodiversity of the land and is one cause of desertification and erosion. Overgrazing is also seen as a cause of the spread of invasive species of non-native plants and of weeds. Degrading land, emissions from animal agriculture and reducing the biomass in a ecosystem contribute directly to climate change between grazing events.