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124-942: Public works are a broad category of infrastructure projects, financed and procured by a government body for recreational, employment, and health and safety uses in the greater community . They include public buildings ( municipal buildings , schools , and hospitals ), transport infrastructure ( roads , railroads , bridges , pipelines , canals , ports , and airports ), public spaces ( public squares , parks , and beaches ), public services ( water supply and treatment , sewage treatment , electrical grid , and dams ), environmental protection ( drinking water protection , soil erosion reduction, wildlife habitat preservation , preservation and restoration of forests and wetlands) and other, usually long-term, physical assets and facilities . Though often interchangeable with public infrastructure and public capital , public works does not necessarily carry an economic component, thereby being

248-606: A bipedal locomotion and freed hands, giving them a crucial advantage enabling them to live in both forested areas and on the open savanna at a time when Africa was drying up, with savanna encroaching on forested areas. This occurred 10 million to 5 million years ago. By 3 million years ago several australopithecine hominid species had developed throughout Southern , East , and Central Africa . They were tool users rather than tool manufacturers. The next major evolutionary step occurred around 2.3 million BCE, when primitive stone tools were used to scavenge

372-460: A national security viewpoint and the impact on the community that the loss of such facilities would entail. Furthermore, the term public works has recently been expanded to include digital public infrastructure projects. For example, in the United States , the first nationwide digital public works project is an effort to create an open source software platform for e-voting (created and managed by

496-438: A " Wet Sahara " phase, during which larger lakes and more rivers existed. Geographers historically divided the region into several distinct ethnographic sections based on each area's respective inhabitants. The concept has been criticised as a racist construction intended to separate North Africa or "European/White Africa" and "Black Africa" or "Africa noire". Critics from various countries have provided arguments supporting

620-475: A Bantu language with many Arabic , Persian and other Middle Eastern and South Asian loan words , developed as a lingua franca for trade between the different peoples in southeastern Africa. In the Kalahari Desert of Southern Africa, the distinct people known as Bushmen (also "San", closely related to, but distinct from " Hottentots ") have long been present. The San evince unique physical traits, and are

744-410: A Business June 2008 through May 2009) , PFI (Press Freedom Index 2009) Sub-Saharan Africa contains over 1,500 languages. With the exception of the extinct Sumerian (a language isolate ) of Mesopotamia , Afroasiatic has the oldest documented history of any language family in the world. Egyptian was recorded as early as 3200 BCE. The Semitic branch was recorded as early as 2900 BCE in

868-654: A broader term. Construction may be undertaken either by directly employed labour or by a private operator. Public works has been encouraged since antiquity. The Roman emperor Nero encouraged the construction of various infrastructure projects during widespread deflation . Public works is a multi-dimensional concept in economics and politics , touching on multiple arenas including: recreation (parks, beaches, trails), aesthetics (trees, green space), economy (goods and people movement, energy), law (police and courts), and neighborhood (community centers, social services buildings). It represents any constructed object that augments

992-496: A comparable assessment of countries' fiscal policies, promoting transparency and accountability at the international level. In addition, in an econometric study published in the Economic Modelling journal, an analysis on government energy technology spending showed that spending on the renewable energy sector created five more jobs per million dollars invested than spending on fossil fuels . Since sustainable infrastructure

1116-426: A connection between cities, transportation for people and goods, and protection for land against flooding and erosion, they only last for 50 to 100 years. Many were built within the last 50 years, which means many infrastructures need substantial maintenance to continue functioning. However, concrete is not sustainable. The production of concrete contributes up to 8% of the world's greenhouse gas emissions. A tenth of

1240-484: A coordinated focus on both creating the methods of transportation themselves and providing them with networks that are equally or more efficient than existing car networks such as aging highway systems. Another solution to transition into a more sustainable infrastructure is using more sustainable materials. A material is sustainable if the needed amount can be produced without depleting non-renewable resources. It also should have low environmental impacts by not disrupting

1364-546: A different regional breakdown, recognising all 55 member states on the continent—grouping them into five distinct and standard regions. The term serves as a grouping counterpart to North Africa , which is instead grouped with the definition of MENA (i.e. Middle East and North Africa) as it is part of the Arab world , and most North African states are likewise members of the Arab League . However, while they are also member states of

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1488-446: A government, are characteristic of socialism and other public or collectivist forms of government because of their 'tax and spend' policies to achieve long-term economic improvement. However, in the private sector, entrepreneurs bear their own losses and so private-sector firms are generally unwilling to undertake projects that could result in losses or would not develop a revenue stream. Governments will invest in public works because of

1612-494: A higher level of relative sustainability than their traditional counterparts. In a sustainable city, urban resilience as well as infrastructure reliability must both be present. Urban resilience is defined by a city's capacity to quickly adapt or recover from infrastructure defects, and infrastructure reliability means that systems must work efficiently while continuing to maximize their output. When urban resilience and infrastructure reliability interact, cities are able to produce

1736-517: A nation's physical infrastructure. Municipal infrastructure, urban infrastructure , and rural development usually represent the same concept but imply either large cities or developing nations ' concerns respectively. The terms public infrastructure or critical infrastructure are at times used interchangeably. However, critical infrastructure includes public works (dams, waste water systems, bridges, etc.) as well as facilities like hospitals, banks, and telecommunications systems and views them from

1860-417: A provision for unexpected expenses (cost overruns), which typically amount to 10% of the value of the contract. This money is spent during the course of the project only if the construction managers judge that it is necessary, and the expenditure must typically be justified in writing. [REDACTED] The dictionary definition of public works at Wiktionary Infrastructure Especially in light of

1984-519: A rating of "D+" on its infrastructure. This aging infrastructure is a result of governmental neglect and inadequate funding. As the United States presumably looks to upgrade its existing infrastructure, sustainable measures could be a consideration of the design, build, and operation plans. Public infrastructure is that owned or available for use by the public (represented by the government ). It includes: A way to embody personal infrastructure

2108-403: A record high in 2010, partially due to governments' implemented economic stimulus measures with minimal consideration of the environmental consequences. The concern is whether this same pattern will repeat itself. The post-COVID-19 period could determine whether the world meets or misses the emissions goals of the 2015 Paris Agreement and limits global warming to 1.5 degrees C to 2 degrees C. As

2232-624: A region or district would be included with infrastructure, but the private irrigation systems on individual land parcels would be considered land improvements, not infrastructure. Service connections to municipal service and public utility networks would also be considered land improvements, not infrastructure. The term " public works " includes government-owned and operated infrastructure as well as public buildings, such as schools and courthouses. Public works generally refers to physical assets needed to deliver public services . Public services include both infrastructure and services generally provided by

2356-505: A result of the COVID-19 epidemic, a host of factors could jeopardize a low-carbon recovery plan: this includes reduced attention on the global political stage (2020 UN Climate Summit has been postponed to 2021), the relaxing of environmental regulations in pursuit of economic growth, decreased oil prices preventing low-carbon technologies from being competitive, and finally, stimulus programs that take away funds that could have been used to further

2480-402: A result, they soak 30% more water than conventional gardens. Bioswales are planted in paved areas like parking lots or sidewalks and are made to allow for overflow into the sewer system by trapping silt and other pollutants, which are normally left over from impermeable surfaces. Both rain gardens and bioswales mitigate flood impacts and prevent stormwater from polluting local waterways; increase

2604-443: A short-term period of employment, has come to dominate practice, particularly in regions such as Sub-Saharan Africa . Applied in the short term, this is appropriate as a response to transient shocks and acute labour market crises. Investing in public works projects in order to stimulate the general economy has been a popular policy measure since the economic crisis of the 1930s. Spearheaded by U.S. Secretary of Labor Frances Perkins ,

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2728-514: A specified area by using property tax increases. In order to facilitate investment of the private sector in developing countries' infrastructure markets, it is necessary to design risk-allocation mechanisms more carefully, given the higher risks of their markets. The spending money that comes from the government is less than it used to be. From the 1930s to 2019, the United States went from spending 4.2% of GDP to 2.5% of GDP on infrastructure. These under investments have accrued, in fact, according to

2852-792: A specified standard of service by the continuing replacement and refurbishment of its components". Civil defense planners and developmental economists generally refer to both hard and soft infrastructure, including public services such as schools and hospitals , emergency services such as police and fire fighting, and basic services in the economic sector . The notion of infrastructure-based development combining long-term infrastructure investments by government agencies at central and regional levels with public private partnerships has proven popular among economists in Asia (notably Singapore and China), mainland Europe, and Latin America. Military infrastructure

2976-650: A spiritual religious guardian. This imperial cult or system of divine kings was spread to most of central Africa by rivals in kingship migrating and forming new states. Many new states received legitimacy by claiming descent from the Lunda dynasties. The Kingdom of Kongo existed from the Atlantic west to the Kwango river to the east. During the 15th century, the Bakongo farming community was united with its capital at M'banza-Kongo , under

3100-449: A total of US$ 24.9 billion. In irrigation , governments represent almost all spending. In transport and energy a majority of investment is government spending. In ICT and water supply and sanitation , the private sector represents the majority of capital expenditure. Overall, between them aid, the private sector, and non- OECD financiers exceed government spending. The private sector spending alone equals state capital expenditure, though

3224-509: A wide variety of climate zones or biomes . South Africa and the Democratic Republic of the Congo in particular are considered megadiverse countries . It has a dry winter season and a wet summer season. According to paleontology , early hominid skull anatomy was similar to that of their close cousins, the great African forest apes , gorilla and chimpanzee . However, they had adopted

3348-428: Is a rooftop that is partially or completely covered with growing vegetation planted over a membrane. It also includes additional layers, including a root barrier and drainage and irrigation systems. There are several categories of green roofs, including extensive (have a growing media depth ranging from two to six inches) and intensive (have a growing media with a depth greater than six inches). One benefit of green roofs

3472-438: Is defined as "those immobile, non-circulating capital goods that essentially contribute to the production of infrastructure goods and services needed to satisfy basic physical and social requirements of economic agents ". There are two distinct qualities of material infrastructures: 1) fulfillment of social needs and 2) mass production . The first characteristic deals with the basic needs of human life. The second characteristic

3596-527: Is generally paid for by metered user fees. Major investment projects are generally financed by the issuance of long-term bonds . Government-owned and operated infrastructure may be developed and operated in the private sector or in public-private partnerships , in addition to in the public sector . As of 2008 in the United States for example, public spending on infrastructure has varied between 2.3% and 3.6% of GDP since 1950. Many financial institutions invest in infrastructure. According to researchers at

3720-669: Is located on the Swahili coast . Johannesburg is the largest city in South Africa . It is the provincial capital and largest city in Gauteng , which is the wealthiest province in South Africa. While Johannesburg is not one of South Africa's three capital cities , it is the seat of the Constitutional Court . The city is located in the mineral-rich Witwatersrand range of hills, and is

3844-484: Is more beneficial in both an economic and environmental context, it represents the future of infrastructure. Especially with increasing pressure from climate change and diminishing natural resources, infrastructure not only needs to maintain economic development and job development, and a high quality of life for residents, but also protect the environment and its natural resources. Sustainable energy infrastructure includes types of renewable energy power plants as well as

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3968-430: Is necessary to maintain growth and tackle poverty. The returns to investment in infrastructure are very significant, with on average thirty to forty percent returns for telecommunications ( ICT ) investments, over forty percent for electricity generation, and eighty percent for roads . The demand for infrastructure both by consumers and by companies is much higher than the amount invested. There are severe constraints on

4092-546: Is needed, and transmission of information within and between communities." The American Society of Civil Engineers publishes an "Infrastructure Report Card" which represents the organizations opinion on the condition of various infrastructure every 2–4 years. As of 2017 they grade 16 categories, namely aviation, bridges, dams, drinking water , energy, hazardous waste , inland waterways , levees , parks and recreation , ports , rail , roads , schools, solid waste , transit and wastewater . The United States has received

4216-478: Is one of the fastest-growing cities in the world, and also one of the most populous urban agglomerations . Lagos is a major financial centre in Africa; this megacity has the highest GDP, and also houses Apapa , one of the largest and busiest ports on the continent. Dar es Salaam is the former capital of, as well as the most populous city in, Tanzania ; it is a regionally important economic centre. It

4340-409: Is that they reduce stormwater runoff because of its ability to store water in its growing media, reducing the runoff entering the sewer system and waterways, which also decreases the risk of combined sewer overflows. They reduce energy usage since the growing media provides additional insulation, reduces the amount of solar radiation on the roof's surface, and provides evaporative cooling from water in

4464-599: Is the buildings and permanent installations necessary for the support of military forces, whether they are stationed in bases, being deployed or engaged in operations. Examples include barracks, headquarters, airfields, communications facilities, stores of military equipment, port installations, and maintenance stations. Communications infrastructure is the informal and formal channels of communication, political and social networks , or beliefs held by members of particular groups, as well as information technology, software development tools. Still underlying these more conceptual uses

4588-405: Is the idea that infrastructure provides organizing structure and support for the system or organization it serves, whether it is a city, a nation, a corporation, or a collection of people with common interests. Examples include IT infrastructure , research infrastructure, terrorist infrastructure, employment infrastructure, and tourism infrastructure. The term "infrastructure" may be confused with

4712-812: Is the non-availability of infrastructure goods and services. Today, there are various materials that can be used to build infrastructure. The most prevalent ones are asphalt, concrete, steel, masonry, wood, polymers and composites. According to the business dictionary, economic infrastructure can be defined as "internal facilities of a country that make business activity possible, such as communication, transportation and distribution networks , financial institutions and related international markets, and energy supply systems". Economic infrastructure support productive activities and events. This includes roads, highways, bridges, airports, cycling infrastructure , water distribution networks, sewer systems , and irrigation plants. Social infrastructure can be broadly defined as

4836-746: Is the object of economic and legal policy. It compromises the growth and sets norms. It refers to the degree of fair treatment of equal economic data and determines the framework within which economic agents may formulate their own economic plans and carry them out in co-operation with others. Sustainable infrastructure refers to the processes of design and construction that take into consideration their environmental, economic, and social impact. Included in this section are several elements of sustainable schemes, including materials, water, energy, transportation, and waste management infrastructure. Although there are endless other factors of consideration, those will not be covered in this section. Material infrastructure

4960-399: Is the provision of employment by the creation of predominantly public goods at a prescribed wage for those unable to find alternative employment. This functions as a form of social safety net . Public works programmes are activities which entail the payment of a wage (in cash or in kind) by the state, or by an Agent (or cash-for work/CFW). One particular form of public works, that of offering

5084-641: Is thought that the camel was first brought to Egypt after the Persian Empire conquered Egypt in 525 BCE, although large herds did not become common enough in North Africa for camels to be the pack animal of choice for the trans-saharan trade. The Bantu expansion is a major migration movement that originated in West Central Africa (possibly around Cameroon) around 2500 BCE, reaching East and Central Africa by 1000 BCE and Southern Africa by

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5208-794: Is to classify them as two distinct kinds: hard infrastructure and soft infrastructure . Hard infrastructure is the physical networks necessary for the functioning of a modern industrial society or industry . This includes roads, bridges, and railways. Soft infrastructure is all the institutions that maintain the economic , health , social , environmental , and cultural standards of a country. This includes educational programs , official statistics , parks and recreational facilities, law enforcement agencies, and emergency services . The word "infrastructure" has been used in French since 1875 and in English since 1887, originally meaning "installations that form

5332-504: Is to think of it in terms of human capital . Human capital is defined by the Encyclopædia Britannica as "intangible collective resources possessed by individuals and groups within a given population". The goal of personal infrastructure is to determine the quality of the economic agents' values. This results in three major tasks: the task of economic proxies in the economic process (teachers, unskilled and qualified labor, etc.);

5456-534: The 2008 European Union stimulus plan , and the American Recovery and Reinvestment Act of 2009 . While it is argued that capital investment in public works can be used to reduce unemployment, opponents of internal improvement programs argue that such projects should be undertaken by the private sector , not the public sector , because public works projects are often inefficient and costly to taxpayers. Further, some argue that public works, when used excessively by

5580-582: The African countries and territories that are situated fully in that specified region, the term may also include polities that only have part of their territory located in that region, per the definition of the United Nations (UN). This is considered a non-standardised geographical region with the number of countries included varying from 46 to 48 depending on the organisation describing the region (e.g. UN , WHO , World Bank , etc.). The African Union (AU) uses

5704-637: The Bantu expansion . In Southern Africa, their speakers are the Khoikhoi and San (Bushmen), in Southeast Africa, the Sandawe and Hadza . The Niger–Congo family is the largest in the world in terms of the number of languages (1,436) it contains. The vast majority of languages of this family are tonal , such as Yoruba and Igbo . However, others such as Fulani , Wolof and Kiswahili are not. A major branch of

5828-737: The Dutch East India Company . For most of the 17th and 18th centuries, the slowly expanding settlement was a Dutch possession. In 1795, the Dutch colony was captured by the British during the French Revolutionary Wars . The British intended to use Cape Town as a major port on the route to Australia and India . It was later returned to the Dutch in 1803, but soon afterward the Dutch East India Company declared bankruptcy, and

5952-691: The Ethiopian Empire , and the Geledi Sultanate , whose military dominance forced governors of the Omani empire north of the city of Lamu to pay tribute to the Somali Sultan Ahmed Yusuf . According to the theory of recent African origin of modern humans , the mainstream position held within the scientific community, all humans originate from either Southeast Africa or the Horn of Africa. During

6076-459: The H. erectus species. The fossil and genetic evidence shows Homo sapiens developed in Southern and East Africa by around 350,000 to 260,000 years ago and gradually migrated across the continent in waves. Between 50,000 and 60,000 years ago, their expansion out of Africa launched the colonisation of the planet by modern humans. By 10,000 BCE, Homo sapiens had spread to all corners of

6200-578: The Mali Empire , Songhai Empire , the Kanem Empire and the subsequent Bornu Empire . They built stone structures like in Tichit , but mainly constructed in adobe . The Great Mosque of Djenne is most reflective of Sahelian architecture and is the largest adobe building in the world. In the forest zone, several states and empires such as Bono State , Akwamu and others emerged. The Ashanti Empire arose in

6324-694: The Overseas Development Institute , the lack of infrastructure in many developing countries represents one of the most significant limitations to economic growth and achievement of the Millennium Development Goals (MDGs) . Infrastructure investments and maintenance can be very expensive, especially in such areas as landlocked, rural and sparsely populated countries in Africa. It has been argued that infrastructure investments contributed to more than half of Africa's improved growth performance between 1990 and 2005, and increased investment

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6448-650: The Sabaeans , Parthians and Axumites for the wealthy Indo – Greco – Roman trade. In the Middle Ages several powerful Somali empires dominated the region's trade, including the Ajuran Sultanate , which excelled in hydraulic engineering and fortress building, the Sultanate of Adal , whose General Ahmed Gurey was the first African commander in history to use cannon warfare on the continent during Adal's conquest of

6572-643: The Songhai , Zarma and Kanuri . The Old Nubian language is also a member of this family. Major languages of Africa by region, family and number of primary language speakers in millions: Sub-Saharan Africa has several large cities. Lagos is a city in the Nigerian state of Lagos . The city, with its adjoining conurbation , is the most populous in Nigeria , and the second-most populous in Africa after Cairo , Egypt . It

6696-748: The Walls of Benin , which is the largest man-made structure in the world. In the 18th century, the Oyo and the Aro confederacy were responsible for most of the slaves exported from modern-day Nigeria, selling them to European slave traders . Following the Napoleonic Wars , the British expanded their influence into the Nigerian interior. In 1885, British claims to a West African sphere of influence received international recognition, and in

6820-581: The 14th and 15th centuries, large medieval Southeast African kingdoms and states emerged, such as the Buganda , Bunyoro and Karagwe kingdoms of Uganda and Tanzania. During the early 1960s, the Southeast African nations achieved independence from colonial rule. Settlements of Bantu -speaking peoples, who were iron -using agriculturists and herdsmen, were already present south of the Limpopo River by

6944-585: The 18th century in modern-day Ghana . The Kingdom of Nri , was established by the Igbo in the 11th century. Nri was famous for having a priest-king who wielded no military power. Nri was a rare African state which was a haven for freed slaves and outcasts who sought refuge in their territory. Other major states included the kingdoms of Ifẹ and Oyo in the western block of Nigeria which became prominent about 700–900 and 1400 respectively, and center of Yoruba culture. The Yoruba built massive mud walls around their cities,

7068-520: The 1950s and early 1960s, most sub-Saharan African nations achieved independence from colonial rule. According to the 2022 revision of the World Population Prospects , the population of sub-Saharan Africa was 1.1 billion in 2019. The current growth rate is 2.3%. The UN predicts for the region a population between 2 and 2.5 billion by 2050 with a population density of 80 per km compared to 170 for Western Europe, 140 for Asia and 30 for

7192-435: The 2017 ASCE Infrastructure Report Card, from 2016 to 2025, infrastructure will be underinvested by $ 2 trillion. Compared to the global GDP percentages, The United States is tied for second-to-last place, with an average percentage of 2.4%. This means that the government spends less money on repairing old infrastructure and or on infrastructure as a whole. In Sub-Saharan Africa , governments spend around US$ 9.4 billion out of

7316-526: The 4th or 5th century displacing and absorbing the original Khoisan speakers. They slowly moved south, and the earliest ironworks in modern-day KwaZulu-Natal Province are believed to date from around 1050. The southernmost group was the Xhosa people , whose language incorporates certain linguistic traits from the earlier Khoisan inhabitants. They reached the Fish River in today's Eastern Cape Province . Monomotapa

7440-767: The Americas. Sub-Saharan African countries top the list of countries and territories by fertility rate with 40 of the highest 50, all with TFR greater than 4 in 2008. All are above the world average except South Africa and Seychelles . More than 40% of the population in sub-Saharan countries is younger than 15 years old, as well as in Sudan , with the exception of South Africa. GDP per Capita (PPP) (2016, 2017 (PPP, US$ )) , Life (Exp.) (Life Expectancy 2006) , Literacy (Male/Female 2006) , Trans (Transparency 2009) , HDI (Human Development Index) , EODBR (Ease of Doing Business Rank June 2008 through May 2009) , SAB ( Starting

7564-644: The Arab League , the Comoros , Djibouti , Mauritania , and Somalia (and sometimes Sudan ) are all geographically considered to be part of sub-Saharan Africa. Overall, the UN Development Programme applies the "sub-Saharan" classification to 46 of Africa's 55 countries, excluding Djibouti, SADR , Somalia, and Sudan. Since around 3900 BCE , the Saharan and sub-Saharan regions of Africa have been separated by

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7688-516: The Dutch (now under French control) and the British found themselves at war again. The British captured the Dutch possession yet again at the Battle of Blaauwberg , commanded by Sir David Blair . The Zulu Kingdom was a Southern African tribal state in what is now KwaZulu-Natal in southeastern South Africa. The small kingdom gained world fame during and after their defeat in the Anglo-Zulu War . During

7812-649: The French word structure . The army use of the term achieved currency in the United States after the formation of NATO in the 1940s, and by 1970 was adopted by urban planners in its modern civilian sense. A 1987 US National Research Council panel adopted the term " public works infrastructure", referring to: "... both specific functional modes – highways, streets, roads, and bridges; mass transit ; airports and airways; water supply and water resources ; wastewater management ; solid-waste treatment and disposal; electric power generation and transmission; telecommunications; and hazardous waste management – and

7936-555: The G20 COVID-19 related fiscal measures was found to be climate friendly. Although it is readily apparent that much effort is needed to repair the economic damage inflicted by the Coronavirus epidemic, an immediate return to business as usual could be environmentally harmful, as shown by the 2007-08 financial crisis in the United States. While the ensuing economic slowdown reduced global greenhouse gas emissions in 2009, emissions reached

8060-617: The Horn of Africa (Ethiopia, Eritrea). The Chadic branch is distributed in Central and West Africa. Hausa , its most widely spoken language, serves as a lingua franca in West Africa (Niger, Ghana, Togo, Benin, Cameroon, and Chad). The several families lumped under the term Khoi-San include languages indigenous to Southern Africa and Tanzania , though some, such as the Khoi languages , appear to have moved to their current locations not long before

8184-702: The Horn of Africa and Sahel related to those in North Africa, who spoke languages belonging to the Afroasiatic family; Negroes in most of the rest of the subcontinent (hence, the toponym Black Africa for Africa south of the Sahara ), who spoke languages belonging to the Niger-Congo and Nilo-Saharan families; and Khoisan in Southern Africa , who spoke languages belonging to the Khoisan family. Sub-Saharan Africa has

8308-640: The Mediterranean. Growing from the proto-Aksumite Iron Age period ( c. 4th century BCE), it rose to prominence by the 1st century CE. The Aksumites constructed monolithic stelae to cover the graves of their kings, such as King Ezana's Stele . The later Zagwe dynasty , established in the 12th century, built churches out of solid rock. These rock-hewn structures include the Church of St. George at Lalibela . In ancient Somalia , city-states flourished such as Opone , Mosyllon and Malao that competed with

8432-539: The Niger–Congo languages is Bantu , which covers a greater geographic area than the rest of the family. Bantu speakers represent the majority of inhabitants in southern, central and southeastern Africa, though San , Pygmy , and Nilotic groups, respectively, can also be found in those regions. Bantu-speakers can also be found in parts of Central Africa such as the Gabon , Equatorial Guinea and southern Cameroon . Swahili ,

8556-660: The Open Source Digital Voting Foundation). Reflecting increased concern with sustainability , urban ecology and quality of life , efforts to move towards sustainable municipal infrastructure are common in developed nations , especially in the European Union and Canada (where the FCM InfraGuide provides an officially mandated best practice exchange to move municipalities in that direction). A public employment programme or public works programme

8680-670: The Sahel (northern Mauritania, northern Mali, northern Niger). The Cushitic branch of Afroasiatic is centered in the Horn, and is also spoken in the Nile Valley and parts of the African Great Lakes region. Additionally, the Semitic branch of the family, in the form of Arabic , is widely spoken in the parts of Africa that are within the Arab world. South Semitic languages are also spoken in parts of

8804-413: The Southeast coast of Kenya and Tanzania encountered by these later Arab and Persian settlers have been variously identified with the trading settlements of Rhapta , Azania and Menouthias referenced in early Greek and Chinese writings from 50 CE to 500 CE. These early writings perhaps document the first wave of Bantu settlers to reach Southeast Africa during their migration. Between

8928-410: The amount of greenhouse gases. There are a variety of types of bioretention and infiltration practices, including rain gardens and bioswales. A rain garden is planted in a small depression or natural slope and includes native shrubs and flowers. They temporarily hold and absorb rain water and are effective in removing up to 90% of nutrients and chemicals and up to 80% of sediments from the runoff. As

9052-421: The application of animal husbandry towards carrying water, food, and supplies across the desert. Prior to the introduction of the camel , the use of oxen, mule, and horses for desert crossing was common, and trade routes followed chains of oases that were strung across the desert. The trans-saharan trade was in full motion by 500 BCE with Carthage being a major economic force for its establishment. It

9176-428: The appropriate built environments for these ecologically preferable modes of transportation. Cities will need to invest in public transportation networks, as well as bike path networks among other sustainable solutions that incentivize citizens to use these alternate transit options. Reducing the urban dependency on cars is a fundamental goal of developing sustainable transportation, and this cannot be accomplished without

9300-411: The art of making fire. They were the first hominids to leave Africa, going on to colonise the entire Old World , and perhaps later on giving rise to Homo floresiensis . Although some recent writers suggest that H. georgicus , a H. habilis descendant , was the first and most primitive hominid to ever live outside Africa, many scientists consider H. georgicus to be an early and primitive member of

9424-467: The basis for any operation or system". It is a loanword from French, where it was already used for establishing a roadbed of substrate material, required before railroad tracks or constructed pavement could be laid on top of it. The word is a combination of the Latin prefix infra- , meaning "below", as many of these constructions are underground (for example, tunnels, water and gas systems, and railways), and

9548-401: The board. However, they must also scale up public investment to ensure successful reopening, boost growth and employment, and green their economies. The unusually large scale of the packages needed for COVID-19 was accompanied by widespread calls for "greening" them to meet the dual goals of economic recovery and environmental sustainability . However, as of March 2021, only a small fraction of

9672-476: The carcasses of animals killed by other predators, both for their meat and their marrow. In hunting, H. habilis was most likely not capable of competing with large predators and was more prey than hunter, although H. habilis likely did steal eggs from nests and may have been able to catch small game and weakened larger prey such as cubs and older animals. The tools were classed as Oldowan . Roughly 1.8 million years ago, Homo ergaster first appeared in

9796-461: The combined system these modal elements comprise. A comprehension of infrastructure spans not only these public works facilities, but also the operating procedures, management practices, and development policies that interact together with societal demand and the physical world to facilitate the transport of people and goods, provision of water for drinking and a variety of other uses, safe disposal of society's waste products, provision of energy where it

9920-613: The construction and maintenance of facilities that support social services . Social infrastructures are created to increase social comfort and promote economic activity. These include schools, parks and playgrounds , structures for public safety , waste disposal plants, hospitals, and sports areas. Core assets provide essential services and have monopolistic characteristics. Investors seeking core infrastructure look for five different characteristics: income, low volatility of returns, diversification, inflation protection, and long-term liability matching. Core infrastructure incorporates all

10044-464: The early centuries CE. The Djenné-Djenno city-state flourished from 250 BCE to 900 CE and was influential to the development of the Ghana Empire . The Nok culture of Nigeria (lasting from 1,500 BCE to 200 CE) is known from a type of terracotta figure. There were a number of medieval empires of the southern Sahara and the Sahel, based on trans-Saharan trade , including the Ghana Empire and

10168-530: The economy. This has serious impacts on households, businesses, and federal, state and local governments. This is especially detrimental to infrastructure because it is so dependent on funding from government agencies – with state and local governments accounting for approximately 75% of spending on public infrastructure in the United States. Governments are facing enormous decreases in revenue, economic downturns, overworked health systems, and hesitant workforces, resulting in huge budget deficits across

10292-446: The established steady-state equilibrium of it. The materials should also be resilient, renewable, reusable, and recyclable. Today, concrete is one of the most common materials used in infrastructure. There is twice as much concrete used in construction than all other building materials combined. It is the backbone of industrialization, as it is used in bridges, piers, pipelines, pavements, and buildings. However, while they do serve as

10416-764: The extremely harsh climate of the sparsely populated Sahara, forming an effective barrier that is interrupted only by the Nile in Sudan, though navigation on the Nile was blocked by the Sudd and the river's cataracts . There is also an evident genetic divide between North Africa and sub-Saharan Africa that dates back to the Neolithic . The Sahara pump theory explains how flora and fauna (including Homo sapiens ) left Africa to penetrate Eurasia and beyond. African pluvial periods are associated with

10540-634: The first female Cabinet member in the United States, the New Deal resulted in the creation of programs such as the Civilian Conservation Corps , Public Works Administration , and the Works Progress Administration , among others, all of which created public goods through labor and infrastructure investments. More recent examples are the 2008–2009 Chinese economic stimulus program , India's National Infrastructure Pipeline of 2020,

10664-618: The first millennium BCE. Trade and improved agricultural techniques supported more sophisticated societies, leading to the early civilisations of Sao , Kanem , Bornu , Shilluk , Baguirmi , and Wadai . Following the Bantu Migration into Central Africa, during the 14th century, the Luba Kingdom in southeast Congo came about under a king whose political authority derived from religious, spiritual legitimacy. The kingdom controlled agriculture and regional trade of salt and iron from

10788-534: The first millennium CE, Nilotic and Bantu -speaking peoples moved into the region , and the latter now account for three-quarters of Kenya's population. On the coastal section of Southeast Africa, a mixed Bantu community developed through contact with Muslim Arab and Persian traders, leading to the development of the mixed Arab, Persian and African Swahili City States . The Swahili culture that emerged from these exchanges evinces many Arab and Islamic influences not seen in traditional Bantu culture, as do

10912-458: The following overlapping or related concepts. Land improvement and land development are general terms that in some contexts may include infrastructure, but in the context of a discussion of infrastructure would refer only to smaller-scale systems or works that are not included in infrastructure, because they are typically limited to a single parcel of land , and are owned and operated by the landowner. For example, an irrigation canal that serves

11036-558: The following year the Royal Niger Company was chartered under the leadership of Sir George Goldie . In 1900, the company's territory came under the control of the British government, which moved to consolidate its hold over the area of modern Nigeria. On 1 January 1901, Nigeria became a British protectorate as part of the British Empire , the foremost world power at the time. Nigeria was granted its independence in 1960 during

11160-696: The forebears of the Habesha . In northern Somalia was Barbara or the Bilad al-Barbar ("Land of the Berbers "), which was inhabited by the Eastern Baribah or Barbaroi , as the ancestors of the Somalis were referred to by medieval Arab and ancient Greek geographers, respectively. In the 19th and 20th centuries, the populations south of the Sahara were divided into three broad ancestral groups: Hamites and Semites in

11284-428: The form of a large network; in other words, hard infrastructure . Efforts to devise more generic definitions of infrastructures have typically referred to the network aspects of most of the structures, and to the accumulated value of investments in the networks as assets. One such definition from 1998 defined infrastructure as the network of assets "where the system as a whole is intended to be maintained indefinitely at

11408-517: The form of the Akkadian language of Mesopotamia ( Assyria and Babylonia ) and circa 2500 BCE in the form of the Eblaite language of northeastern Syria . The distribution of the Afroasiatic languages within Africa is principally concentrated in North Africa and the Horn of Africa. Languages belonging to the family's Berber branch are mainly spoken in the north, with its speech area extending into

11532-502: The fossil record in Africa. From Homo ergaster , Homo erectus (upright man) evolved 1.5 million years ago. Some of the earlier representatives of this species were small-brained and used primitive stone tools , much like H. habilis . The brain later grew in size, and H. erectus eventually developed a more complex stone tool technology called the Acheulean . Potentially the first hominid to engage in hunting, H. erectus mastered

11656-473: The government. Infrastructure may be owned and managed by governments or by privately held companies, such as sole public utility or railway companies. Generally, most roads, major airports and other ports, water distribution systems, and sewage networks are publicly owned, whereas most energy and telecommunications networks are privately owned. Publicly owned infrastructure may be paid for from taxes, tolls, or metered user fees, whereas private infrastructure

11780-472: The holistic and effective management of water resources. Increasingly, policy makers and regulators are incorporating Nature-based solutions (NBS or NbS) into attempts to achieve sustainable water infrastructure. Sustainable waste management systems aim to minimize the amount of waste products produced by individuals and corporations. Commercial waste management plans have transitioned from simple waste removal plans into comprehensive plans focused on reducing

11904-480: The impact of raindrops on barren surfaces, minimize soil moisture through transpiration, and they help reduce stormwater runoff. Additionally, trees contribute to recharging local aquifers and improve the health of watershed systems. Trees also reduce energy usage by providing shade and releasing water into the atmosphere which cools the air and reduces the amount of heat absorbed by buildings. Finally, trees improve air quality by absorbing harmful air pollutants reducing

12028-451: The importance of personal infrastructure for an individual (short and long-term consumption of education); and the social relevance of personal infrastructure. Essentially, personal infrastructure maps the human impact on infrastructure as it is related to the economy, individual growth, and social impact. Institutional infrastructure branches from the term "economic constitution". According to Gianpiero Torrisi , institutional infrastructure

12152-558: The indigenous people of southern Africa. Pygmies are the pre-Bantu indigenous peoples of Central Africa. The Nilo-Saharan languages are concentrated in the upper parts of the Chari and Nile rivers of Central Africa and Southeast Africa. They are principally spoken by Nilotic peoples and are also spoken in Sudan among the Fur , Masalit , Nubian and Zaghawa peoples and in West and Central Africa among

12276-613: The interconnectedness of continental Africa, pointing to historical and cultural connections, as well as trade between North, West, and East Africa . Commentators in Arabic in the medieval period used the general term bilâd as-sûdân ("Land of the Blacks") for the vast Sudan region (an expression denoting Central and West Africa ), or sometimes extending from the coast of West Africa to Western Sudan . Its equivalent in Southeast Africa

12400-666: The king title, Manikongo . Other significant states and peoples included the Kuba Kingdom , producers of the famous raffia cloth, the Eastern Lunda , Bemba , Burundi , Rwanda , and the Kingdom of Ndongo . Nubia , covered by present-day northern Sudan and southern Egypt , was referred to as " Aethiopia " ("land of the burnt face") by the Greeks . Nubia in her greatest phase is considered sub-Saharan Africa's oldest urban civilisation. Nubia

12524-416: The little parts of the engineering world that make life more convenient and efficient. They are needed to ensure successful usage and marketing of an already finished product, like in the case of road bridges . Other examples are lights on sidewalks, landscaping around buildings, and benches where pedestrians can rest. Engineers generally limit the term "infrastructure" to describe fixed assets that are in

12648-635: The main types of infrastructure, such as roads, highways, railways, public transportation , water, and gas supply. Basic infrastructure refers to main railways, roads, canals, harbors and docks, the electromagnetic telegraph, drainage, dikes, and land reclamation. It consist of the more well-known and common features of infrastructure that we come across in our daily lives (buildings, roads, docks). Complementary infrastructure refers to things like light railways, tramways, and gas/electricity/water supply. To complement something means to bring it to perfection or complete it. Complementary infrastructure deals with

12772-487: The majority is focused on ICT infrastructure investments. External financing increased in the 2000s (decade) and in Africa alone external infrastructure investments increased from US$ 7 billion in 2002 to US$ 27 billion in 2009. China, in particular, has emerged as an important investor. The 2020 COVID-19 pandemic has only exacerbated the underfunding of infrastructure globally that has been accumulating for decades. The pandemic has increased unemployment and has widely disrupted

12896-511: The many Afro-Arab members of the Bantu Swahili people . With its original speech community centered on the coastal parts of Tanzania (particularly Zanzibar ) and Kenya  – a seaboard referred to as the Swahili Coast  – the Bantu Swahili language contains many Arabic loan-words as a consequence of these interactions. The earliest Bantu inhabitants of

13020-556: The market by prevailing non renewable energy sources. Sustainable water infrastructure is focused on a community's sufficient access to clean, safe drinking water. Water is a public good along with electricity, which means that sustainable water catchment and distribution systems must remain affordable to all members of a population. "Sustainable Water" may refer to a nation or community's ability to be self-sustainable, with enough water to meet multiple needs including agriculture, industry, sanitation, and drinking water. It can also refer to

13144-581: The massive societal transformations needed to mitigate and adapt to climate change, contemporary infrastructure conversations frequently focus on sustainable development and green infrastructure . Acknowledging this importance, the international community has created policy focused on sustainable infrastructure through the Sustainable Development Goals , especially Sustainable Development Goal 9 " Industry, Innovation and Infrastructure ". One way to describe different types of infrastructure

13268-601: The means of exchange from the plant to the homes and businesses that use that energy. Renewable energy includes well researched and widely implemented methods such as wind, solar, and hydraulic power, as well as newer and less commonly used types of power creation such as fusion energy. Sustainable energy infrastructure must maintain a strong supply relative to demand, and must also maintain sufficiently low prices for consumers so as not to decrease demand. Any type of renewable energy infrastructure that fails to meet these consumption and price requirements will ultimately be forced out of

13392-506: The most famous being Sungbo's Eredo . Another prominent kingdom in southwestern Nigeria was the Kingdom of Benin , whose power lasted between the 15th and 19th century. Their dominance reached as far as the well-known city of Eko which was named Lagos by the Portuguese traders and other early European settlers. The Edo -speaking people of Benin are known for their famous bronze casting and rich coral, wealth, ancient science and technology and

13516-627: The natural processes needed to manage water, reduce the effects of disasters such as flooding, and create healthier urban environments. In a more practical sense, it refers to a decentralized network of stormwater management practices, which includes green roofs, trees, bioretention and infiltration, and permeable pavement. Green infrastructure has become an increasingly popular strategy in recent years due to its effectiveness in providing ecological, economic, and social benefits – including positively impacting energy consumption, air quality, and carbon reduction and sequestration. A green roof

13640-691: The north and copper from the Zambian/Congo copper belt. Rival kingship factions which split from the Luba Kingdom later moved among the Lunda people, marrying into its elite and laying the foundation of the Lunda Empire in the 16th century. The ruling dynasty centralised authority among the Lunda under the Mwata Yamyo or Mwaant Yaav. The Mwata Yamyo's legitimacy, like that of the Luba king, came from being viewed as

13764-471: The overall benefit to society when there is a lack of private sector benefit (a project that does generate revenue) or the risk is too great for a private company to accept on its own. According to research conducted at the Aalborg University , 86% of public works projects end up with cost overruns. Some findings of the research were the following: Generally, contracts awarded by public tenders include

13888-678: The period of decoloniszation . Archeological finds in Central Africa provide evidence of human settlement that may date back over 10,000 years. According to Zangato and Holl, there is evidence of iron-smelting in the Central African Republic and Cameroon that may date back to 3,000 to 2,500 BCE. Extensive walled sites and settlements have recently been found in Zilum , Chad. The area is located approximately 60 km (37 mi) southwest of Lake Chad, and has been radiocarbon dated to

14012-492: The plants, which reduce the roof surface temperatures and heat influx. Green roofs also reduce atmospheric carbon dioxide since the vegetation sequesters carbon and, since they reduce energy usage and the urban heat island by reducing the roof temperature, they also lower carbon dioxide emissions from electricity generation. Tree planting provides a host of ecological, social, and economic benefits. Trees can intercept rain, support infiltration and water storage in soil, diminish

14136-615: The process of decarbonization . Research suggests that a recovery plan based on lower-carbon emissions could not only make significant emissions reductions needed to battle climate change, but also create more economic growth and jobs than a high-carbon recovery plan would. A study published in the Oxford Review of Economic Policy, more than 200 economists and economic officials reported that "green" economic-recovery initiatives performed at least as well as less "green" initiatives. There have also been calls for an independent body could provide

14260-476: The same level of output at similarly reasonable costs as compared to other non sustainable communities, while still maintaining ease of operation and usage. Sub-Saharan Africa Sub-Saharan Africa or Subsahara is the area and regions of the continent of Africa that lie south of the Sahara . These include Central Africa , East Africa , Southern Africa , and West Africa . Geopolitically, in addition to

14384-472: The supply side of the provision of infrastructure in Asia. The infrastructure financing gap between what is invested in Asia-Pacific (around US$ 48 billion) and what is needed (US$ 228 billion) is around US$ 180 billion every year. In Latin America, three percent of GDP (around US$ 71 billion) would need to be invested in infrastructure in order to satisfy demand, yet in 2005, for example, only around two percent

14508-471: The total amount of waste produced before removal. Sustainable waste management is beneficial environmentally, and can also cut costs for businesses that reduce their amount of disposed goods. Sustainable transportation includes a shift away from private, greenhouse gas emitting cars in favor of adopting methods of transportation that are either carbon neutral or reduce carbon emissions such as bikes or electric bus systems. Additionally, cities must invest in

14632-442: The usable water supply by reducing the amount of water needed for outdoor irrigation; improve air quality by minimizing the amount of water going into treatment facilities, which also reduces energy usage and, as a result, reduces air pollution since less greenhouse gases are emitted. Smart cities use innovative methods of design and implementation in various sectors of infrastructure and planning to create communities that operate at

14756-460: The world's industrial water usage is from producing concrete. Even transporting the raw materials to concrete production sites adds to airborne pollution. Furthermore, the production sites and the infrastructures themselves all strip away agricultural land that could have been fertile soil or habitats vital to the ecosystem. Green infrastructure is a type of sustainable infrastructure. Green infrastructure uses plant or soil systems to restore some of

14880-509: The world. This dispersal of the human species is suggested by linguistic, cultural and genetic evidence. During the 11th millennium BP , pottery was independently invented in West Africa, with the earliest pottery there dating to about 9,400 BC from central Mali. It spread throughout the Sahel and southern Sahara . After the Sahara became a desert, it did not present a totally impenetrable barrier for travelers between north and south because of

15004-625: Was Zanj ("Country of the Blacks"), which was situated in the vicinity of the Great Lakes region. The geographers drew an explicit ethnographic distinction between the Sudan region and its analogue Zanj, from the area to their extreme east on the Red Sea coast in the Horn of Africa . In modern-day Ethiopia and Eritrea was Al-Habash or Abyssinia, which was inhabited by the Habash or Abyssinians, who were

15128-423: Was a major source of gold for the ancient world. Nubians built famous structures and numerous pyramids. Sudan, the site of ancient Nubia, has more pyramids than anywhere else in the world. The Axumite Empire spanned the southern Sahara, south Arabia and the Sahel along the western shore of the Red Sea . Located in northern Ethiopia and Eritrea , Aksum was deeply involved in the trade network between India and

15252-527: Was a medieval kingdom (c. 1250–1629), which existed between the Zambezi and Limpopo rivers of Southern Africa in the territory of modern-day Zimbabwe and Mozambique . Its old capital was located at Great Zimbabwe . In 1487, Bartolomeu Dias became the first European to reach the southernmost tip of Africa. In 1652, a victualling station was established at the Cape of Good Hope by Jan van Riebeeck on behalf of

15376-768: Was invested leaving a financing gap of approximately US$ 24 billion. In Africa, in order to reach the seven percent annual growth calculated to be required to meet the MDGs by 2015 would require infrastructure investments of about fifteen percent of GDP, or around US$ 93 billion a year. In fragile states , over thirty-seven percent of GDP would be required. The source of financing for infrastructure varies significantly across sectors. Some sectors are dominated by government spending , others by overseas development aid (ODA) , and yet others by private investors. In California, infrastructure financing districts are established by local governments to pay for physical facilities and services within

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