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File:Coal.jpg

Fossil fuels or mineral fuels are fuels formed by the natural resources such as anaerobic decomposition of buried dead organisms that lived up to 300 million years ago.[1] These fuels contain high percentage of carbon and hydrocarbons.

Fossil fuels range from volatile materials with low carbon:hydrogen ratios like methane, to liquid petroleum to nonvolatile materials composed of almost pure carbon, like anthracite coal. Methane can be found in hydrocarbon fields, alone, associated with oil, or in the form of methane clathrates. It is generally accepted that they formed from the fossilized remains of dead plants and animals[2] by exposure to heat and pressure in the Earth's crust over hundreds of millions of years.[3] This biogenic theory was first introduced by Georg Agricola in 1556 and later by Mikhail Lomonosov in the 18th century.

It was estimated by the Energy Information Administration that in 2006 primary sources of energy consisted of petroleum 36.8%, coal 26.6%, natural gas 22.9%, amounting to an 86% share for fossil fuels in primary energy production in the world. Non-fossil sources included hydroelectric 6.3%, nuclear 6.0%, and (geothermal, solar, wind, wood waste) amounting 0.9 percent.[4] World energy consumption was growing about 2.3% per year.

Fossil fuels are non-renewable resources because they take millions of years to form, and reserves are being depleted much faster than new ones are being formed. The production and use of fossil fuels raise environmental concerns. A global movement toward the generation of renewable energy is therefore under way to help meet increased energy needs.

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The burning of fossil fuels produces around 21.3 billion tons (21.3 gigatons) of carbon dioxide per year, but it is estimated that natural processes can only absorb about half of that amount, so there is a net increase of 10.65 billion tones of atmospheric carbon dioxide per year (one tonne of atmospheric carbon is equivalent to 44/12 or 3.7 tons of carbon dioxide).[5] Carbon dioxide is one of the greenhouse gases that enhances radiative forcing and contributes to global warming, causing the average surface temperature of the Earth to rise in response, which climate scientists agree will cause major adverse effects.

OriginEdit

Fossil fuels are formed by the anaerobic decomposition of remains of organisms including phytoplankton and zooplankton that settled to the sea (or lake) bottom in large quantities under anoxic conditions, millions of years ago. Over geological time, this organic matter, mixed with mud, got buried under heavy layers of sediment. The resulting high levels of heat and pressure caused the organic matter to chemically alter, first into a waxy material known as kerogen which is found in oil shales, and then with more heat into liquid and gaseous hydrocarbons in a process known as catagenesis.

Terrestrial plants, on the other hand, tend to form coal. Many of the coal fields date to the Carboniferous period of Earth's history.

Comparative figures:

  • 1 litre of regular gasoline is the time-rendered result of about 23.5 metric tons of ancient organic material deposited on the ocean floor.[6]
  • The total fossil fuel used in the year 1997 is the result of 422 years of all plant matter that grew on the entire surface and in all the oceans of the ancient earth.[6]

ImportanceEdit

File:Gulf Offshore Platform.jpg

Fossil fuels are of great importance because they can be burned (oxidized to carbon dioxide and water), producing significant amounts of energy. The use of coal as a fuel predates recorded history. Coal was used to run furnaces for the melting of metal ore. Semi-solid hydrocarbons from seeps were also burned in ancient times,[7] but these materials were mostly used for waterproofing and embalming.[8]

Commercial exploitation of petroleum, largely as a replacement for oils from animal sources (notably whale oil) for use in oil lamps began in the nineteenth century.[9]

Natural gas, once flared-off as an un-needed byproduct of petroleum production, is now considered a very valuable resource.[10]

Heavy crude oil, which is much more viscous than conventional crude oil, and tar sands, where bitumen is found mixed with sand and clay, are becoming more important as sources of fossil fuel.[11] Oil shale and similar materials are sedimentary rocks containing kerogen, a complex mixture of high-molecular weight organic compounds, which yield synthetic crude oil when heated (pyrolyzed). These materials have yet to be exploited commercially.[12]These fuels are employed in internal combustion engines, fossil fuel power stations and other uses.

File:Grangemouth04nov06.jpg

Prior to the latter half of the eighteenth century, windmills or watermills provided the energy needed for industry such as milling flour, sawing wood or pumping water, and burning wood or peat provided domestic heat. The wide-scale use of fossil fuels, coal at first and petroleum later, to fire steam engines, enabled the Industrial Revolution. At the same time, gas lights using natural gas or coal gas were coming into wide use. The invention of the internal combustion engine and its use in automobiles and trucks greatly increased the demand for gasoline and diesel oil, both made from fossil fuels. Other forms of transportation, railways and aircraft also required fossil fuels. The other major use for fossil fuels is in generating electricity and the petrochemical industry. Tar, a leftover of petroleum extraction, is used in construction of roads.

Limits and alternativesEdit

Main article: Peak oil
Global Carbon Emission by Type to Y2004

Global fossil carbon emission by fuel type, 1800-2004 AD.

The principle of supply and demand suggests that as hydrocarbon supplies diminish, prices will rise. Therefore higher prices will lead to increased alternative, renewable energy supplies as previously uneconomic sources become sufficiently economical to exploit. Artificial gasolines and other renewable energy sources currently require more expensive production and processing technologies than conventional petroleum reserves, but may become economically viable in the near future. See Energy development. Different alternative sources of energy include nuclear, hydroelectric, solar, wind, and geothermal.

Levels and flowsEdit

Main article: Peak oil

Levels of primary energy sources are the reserves in the ground. Flows are production. The most important part of primary energy sources are the carbon based fossil energy sources. Oil, coal, and gas stood for 79.6% of primary energy production during 2002 (in million tones of oil equivalent (mtoe)) (34.9+23.5+21.2).

Levels (proved reserves) during 2005-2007

  • Oil: 1,119-1,317 billion barrels (178-209 billion m³)[13]
  • Gas: 6,183-6,381 trillion cubic feet (175-181 trillion m³)[13], 1,161 billion barrel oil equivalent (BBOE)
  • Coal: 997,748 million short tons (905 billion tonnes) [14], 4,416 BBOE

Flows (daily production) during 2006

  • Oil: 84 million barrels per day (13 million m³)[15]
  • Gas: 104,435 billion cubic feet (2,960 billion m³)[16], 19 million barrels oil equivalent per day (MBOED)
  • Coal: 10,230 thousand short tons (9,280 tonnes)[17], 29 MBOED

Years of production left in the ground with the most optimistic proved reserve estimates (Oil & Gas Journal, World Oil)

  • Oil: 43 years
  • Gas: 167 years
  • Coal: 417 years

Note that this calculation assumes that the product could be produced at a constant level for that number of years and that all of the proved reserves could be recovered. In reality, consumption of all three resources has been increasing. While this suggests that the resource will be used up more quickly, in reality, the production curve is much more akin to a bell curve. At some point in time, the production of each resource within an area, country, or globally will reach a maximum value, after which, the production will decline until it reaches a point where is no longer economically feasible or physically possible to produce. See Hubbert peak theory for detail on this decline curve with regard to petroleum. Note also that proved reserve estimates do not include strategic reserves, which (globally) amount to 4.1 billion more barrels.

The above discussion emphasizes worldwide energy balance. It is also valuable to understand the ratio of reserves to annual consumption (R/C) by region or country. For example, energy policy of the United Kingdom recognizes that Europe's R/C value is 3.0, very low by world standards, and exposes that region to energy vulnerability. Specific alternatives to fossil fuels are a subject of intense debate worldwide.

Environmental effects Edit

Main article: Climate change

In the United States, more than 90% of greenhouse gas emissions come from the combustion of fossil fuels.[18] Combustion of fossil fuels also produces other air pollutants, such as nitrogen oxides, sulfur dioxide, volatile organic compounds and heavy metals.

According to Environment Canada:

"The electricity sector is unique among industrial sectors in its very large contribution to emissions associated with nearly all air issues. Electricity generation produces a large share of Canadian nitrogen oxides and sulphur dioxide emissions, which contribute to smog and acid rain and the formation of fine particulate matter. It is the largest uncontrolled industrial source of mercury emissions in Canada. Fossil fuel-fired electric power plants also emit carbon dioxide, which may contribute to climate change. In addition, the sector has significant impacts on water and habitat and species. In particular, hydro dams and transmission lines have significant effects on water and biodiversity."[19]

File:Carbon Dioxide 400kyr.png

According to U.S. Scientist Jerry Mahlman and USA Today: Mahlman, who crafted the IPCC language used to define levels of scientific certainty, says the new report will lay the blame at the feet of fossil fuels with "virtual certainty," meaning 99% sure. That's a significant jump from "likely," or 66% sure, in the group's last report in 2001, Mahlman says. His role in this year's effort involved spending two months reviewing the more than 1,600 pages of research that went into the new assessment.[20]

Combustion of fossil fuels generates sulfuric, carbonic, and nitric acids, which fall to Earth as acid rain, impacting both natural areas and the built environment. Monuments and sculptures made from marble and limestone are particularly vulnerable, as the acids dissolve calcium carbonate.

Fossil fuels also contain radioactive materials, mainly uranium and thorium, which are released into the atmosphere. In 2000, about 12,000 metric tons of thorium and 5,000 metric tons of uranium were released worldwide from burning coal.[21] It is estimated that during 1982, US coal burning released 155 times as much radioactivity into the atmosphere as the Three Mile Island incident.[22] However, this radioactivity from coal burning is minuscule at each source and has not shown to have any adverse effect on human physiology.

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Burning coal also generates large amounts of bottom ash and fly ash. These materials are used in a wide variety of applications, utilizing, for example, about 40% of the US production.[23]

Harvesting, processing, and distributing fossil fuels can also create environmental concerns. Coal mining methods, particularly mountaintop removal and strip mining, have negative environmental impacts, and offshore oil drilling poses a hazard to aquatic organisms. Oil refineries also have negative environmental impacts, including air and water pollution. Transportation of coal requires the use of diesel-powered locomotives, while crude oil is typically transported by tanker ships, each of which requires the combustion of additional fossil fuels.

Environmental regulation uses a variety of approaches to limit these emissions, such as command-and-control (which mandates the amount of pollution or the technology used), economic incentives, or voluntary programs.

An example of such regulation in the USA is the "EPA is implementing policies to reduce airborne mercury emissions. Under regulations issued in 2005, coal-fired power plants will need to reduce their emissions by 70 percent by 2018."[24].

In economic terms, pollution from fossil fuels is regarded as a negative externality. Taxation is considered one way to make societal costs explicit, in order to 'internalize' the cost of pollution. This aims to make fossil fuels more expensive, thereby reducing their use and the amount of pollution associated with them, along with raising the funds necessary to counteract these factors. Although European nations impose some pollution taxes, they also give billions of subsidiesTemplate:Clarify me to the fossil fuel industry, offsetting the taxes.

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Former CIA Director James Woolsey recently outlined the national security arguments in favor of moving away from fossil fuels.[25]

See also Edit

References Edit

  1. David Shannon, Osman Chughtai. "Fossil Fuels". Retrieved on 2009-04-22.
  2. Dr. Irene Novaczek. "Canada's Fossil Fuel Dependency". Elements. Retrieved on 2007-01-18.
  3. "Fossil fuel". EPA. Retrieved on 2007-01-18.
  4. "International Energy Annual 2006". Retrieved on 2009-02-08.
  5. "US Department of Energy on greenhouse gases". Retrieved on 2007-09-09.
  6. 6.0 6.1 "science show". Archived from the original on 2003-12-07. Retrieved on 2008-04-11.
  7. "Encyclopedia Britannica, use of oil seeps in accient times". Retrieved on 2007-09-09.
  8. Bilkadi, Zayn (1994). "BULLS FROM THE SEA : Ancient Oil Industries" ([dead link]). Aramco World. Retrieved on 2007-09-09.
  9. Ball, Max W.; Douglas Ball, Daniel S. Turner (1965). This Fascinating Oil Business. Indianapolis: Bobbs-Merrill. ISBN 0-672-50829-X. 
  10. Kaldany,, Rashad, Director Oil, Gas, Mining and Chemicals Dept, World Bank (December 13, 2006). "Global Gas Flaring Reduction: A Time for Action!" (PDF) in Global Forum on Flaring & Gas Utilization.. Retrieved on 2007-09-09. 
  11. "Oil Sands Global Market Potential 2007". Retrieved on 2007-09-09.
  12. "US Department of Energy plans for oil shale development". Retrieved on 2007-09-09.
  13. 13.0 13.1 World Proved Reserves of Oil and Natural Gas, Most Recent Estimates
  14. World Estimated Recoverable Coal
  15. http://www.eia.doe.gov/emeu/international/RecentPetroleumConsumptionBarrelsperDay.xls
  16. http://web.archive.org/web/20010612154834/http://www.eia.doe.gov/pub/international/iealf/table13.xls
  17. http://web.archive.org/web/20000817093038/http://www.eia.doe.gov/pub/international/iealf/table14.xls
  18. US EPA.2000. Inventory of U.S. Greenhouse Gas Emissions and Sinks: 1990-1998, Rep. EPA 236-R-00-01. US EPA, Washington, DC, http://www.epa.gov/globalwarming
  19. "Electricity Generation". Retrieved on 2007-03-23.
  20. http://www.usatoday.com/tech/science/2007-01-30-ipcc-report_x.htm
  21. Coal Combustion: Nuclear Resource or Danger - Alex Gabbard
  22. Nuclear proliferation through coal burning - Gordon J. Aubrecht, II, Ohio State University
  23. American Coal Ash Association. ""CCP Production and Use Survey"" (PDF).
  24. "Frequently Asked Questions, Information on Proper Disposal of Compact Fluorescent Light Bulbs (CFLs)" (PDF). Retrieved on 2007-03-19.
  25. Video of Woolsey speech

External linksEdit

Debate

ar:وقود أحفوري

an:Combustible fósil be:Выкапнёвае паліва bs:Fosilna goriva ca:Combustible fòssil cs:Fosilní palivo cy:Tanwydd ffosil da:Fossilt brændstof og brændselet:Fossiilne kütuseo:Fosilia brulaĵo eu:Erregai fosil fa:سوخت فسیلیga:Breosla iontaiseach gl:Enerxía fósilhr:Fosilna goriva id:Bahan bakar fosil is:Jarðefnaeldsneyti it:Combustibili fossili he:דלק מאובנים la:Fomes fossilis hu:Fosszilis tüzelőanyagok mk:Фосилни горива ml:ഖനിജ ഇന്ധനം mr:जीवाष्म इंधन mn:Шатах ашигт малтмал nl:Fossiele brandstofno:Fossilt brensel nn:Fossil energi oc:Combustible fossil pl:Paliwa kopalne pt:Combustível fóssil ro:Combustibil fosil qu:Rumiyasqa rawranasimple:Fossil fuel sk:Fosílne palivo sl:Fosilno gorivo sr:Фосилна горива sh:Fosilna goriva su:Suluh fosil fi:Fossiilinen polttoaine sv:Fossila bränslen ta:புதைபடிவ எரிமம் th:เชื้อเพลิงซากดึกดำบรรพ์ tr:Fosil yakıtlar uk:Горючі корисні копалини vi:Nhiên liệu hóa thạch zh-yue:化石燃料

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