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References

Definitions and Notes

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Abbreviations

This information is included in the Abbreviations reference guide, which includes all abbreviations and acronyms used in the Factbook, with their expansions.

Acronyms

An acronym is an abbreviation coined from the initial letter of each successive word in a term or phrase. In general, an acronym made up solely from the first letter of the major words in the expanded form is rendered in all capital letters (NATO from North Atlantic Treaty Organization; an exception would be ASEAN for Association of Southeast Asian Nations). In general, an acronym made up of more than the first letter of the major words in the expanded form is rendered with only an initial capital letter (Comsat from Communications Satellite Corporation; an exception would be NAM from Nonaligned Movement). Hybrid forms are sometimes used to distinguish between initially identical terms (ICC for International Chamber of Commerce and ICCt for International Criminal Court).

Administrative divisions

This entry gives the numbers, designatory terms, and first-order administrative divisions as approved by the US Board on Geographic Names (BGN). Changes that have been reported but not yet acted on by the BGN are noted. Geographic names conform to spellings approved by the BGN with the exception of the omission of diacritical marks and special characters.
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Age structure

This entry provides the distribution of the population according to age. Information is included by sex and age group as follows: 0-14 years (children), 15-64 years (working age), and 65 years and over (elderly)
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Agricultural products

This entry provides a list of a country's most important agricultural products, listed by annual tonnage.
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Air pollutants

This entry refers to specified gases and particulates released by various sources, including animals, plants, goods, and processes.

particulate matter emissions - This entry provides the modeled annual mean concentration of particulate matter of less than 2.5 microns in diameter (PM2.5) measured in micrograms per cubic meter of air. Exposure to PM2.5 pollutants should not exceed an annual mean concentration of 10 micrograms per cubic meter, according to World Health Organization guidelines. Particulate matter are inhalable and respirable particles composed of sulphate, nitrates, ammonia, sodium chloride, black carbon, mineral dust, and water. Fine particles less than 2.5 microns pose the greatest health risks because they can penetrate the lungs and enter the bloodstream. Sources include combustion engines, solid-fuel combustion, and other industrial activities. 

carbon dioxide emissions - This entry provides the annual quantity of carbon dioxide emissions for a country, as measured in megatons. Human-influenced sources include the burning of fossil fuels (including coal, natural gas, and oil), solid waste, trees, and other biological materials, as well as certain chemical processes, such as cement production. Natural sources include decomposition, ocean release, and respiration. 

methane emissions - This entry provides the annual quantity of methane emissions for a country, as measured in megatons. Methane is emitted during the breakdown of organic material from human-influenced and natural processes. Human-influenced sources include the production and transport of coal, natural gas, and oil; the decay of organic waste in landfills; agricultural activities; stationary and mobile combustion; waste-water treatment; and certain industrial processes. Natural sources include the decay of plant material in wetlands, the seepage of gas from underground deposits, and the digestion of food by ruminants. 

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Airports

This entry gives the total number of active airports or airfields and includes both civilian and military facilities. The runway(s) may be paved (concrete or asphalt surfaces) or unpaved (grass, earth, sand, or gravel surfaces). Airports or airfields that are closed are not included. Note that not all airports have accommodations for refueling, maintenance, or air traffic control.
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Alcohol consumption per capita

This entry provides information on alcohol consumption per capita (APC), which is the recorded amount of alcohol consumed per capita by persons aged 15 years and over in a calendar year, measured in liters of pure alcohol.  APC is broken down further into beer, wine, spirits, and other subfields. Beer includes malt beers, wine includes wine made from grapes, spirits include all distilled beverages, and other includes one or several other alcoholic beverages, such as fermented beverages made from sorghum, maize, millet, rice, or cider, fruit wine, and fortified wine.  APC only takes into account the consumption that is recorded from production, import, export, and sales data, primarily derived from taxation.

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Area

This entry includes three subfields. Total area is the sum of all land and water areas delimited by international boundaries and/or coastlines. Land area is the aggregate of all surfaces delimited by international boundaries and/or coastlines, excluding inland water bodies (lakes, reservoirs, rivers). Water area is the sum of the surfaces of all inland water bodies, such as lakes, reservoirs, or rivers, as delimited by international boundaries and/or coastlines.
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Area - comparative

This entry provides an area comparison based on total area equivalents. Most entities are compared with the entire US or one of the 50 states based on area measurements (1990 revised) provided by the US Bureau of the Census. The smaller entities are compared with Washington, DC (178 sq km, 69 sq mi) or The Mall in Washington, DC (0.59 sq km, 0.23 sq mi, 146 acres).
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Area - rankings

This entry, which appears only in the World Geography category, provides rankings for the earth's largest (or smallest) continents, countries, oceans, islands, mountain ranges, or other physical features.
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Average household expenditures

This entry refers to the average consumer expenditures on food, alcohol, and tobacco for the country specified in a given year. The data is presented as a percentage of all goods and services consumed in private settings for personal or household uses.
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