If a free source of hydrogen exists then no CO2 is produced. Since hydrogen does not exist in high concentrations as a free form on the earth it must be made either through electrolysis of water or from processing natural gas in a refinery. The former is possible with any means of electricity and the amount of CO2 generated is dependent on the means of generation (coal, natural gas, wind, solar, hydroelectric, nuclear etc.)
The fossil fuel that releases the least amount of carbon dioxide is natural gas, which is mostly methane (CH4). This is due to the methane having the lowest carbon to hydrogen ratio of another fossil fuel source.
Modern power plants do not produce any smog or harmful emissions other than Carbon Dioxide, and in vehicles the amount of harmful toxins has much more to do with the types of filters the exhaust system utilises than the type of fuel that is used. So I am assuming that by "pollution" you mean Carbon Dioxide (CO2) emissions.
The real answer to your question then is "none", as they all produce significant amounts of CO2 emissions. A possible exception is Hydrogen, as it produces no CO2 during combustion whatsoever. However, it is not commercially exploited as a fossil fuel due to the limited quantity in fossil deposits and its high volatility.
The least amount of CO2 emission per unit of energy produced would be natural gas, followed by liquid hydrocarbons like petrol, diesel and kerosene. The most CO2 intensive fuel, and one of the most widely used, is brown coal. A relatively newly exploited fuel that also produces immense amounts of CO2 throughout its life cycle is Tar sands (bituminous sands).
(Another contributor wrote:)
The fossil fuel that releases the least amount of carbon dioxide is natural gas, which is mostly methane (CH4). This is due to the methane having the lowest carbon to hydrogen ratio of another fossil fuel source.
Per Wikipedia: Natural gas is often described as the cleanest fossil fuel, producing less carbon dioxide per joule delivered than either coal or oil.[14] However, in absolute terms it does contribute substantially to global emissions, and this contribution is projected to grow. See: http://en.wikipedia.org/wiki/Natural_gas
There are only three basic fossil fuels (coal, oil and natural gas).
Of these:
Natural gas releases the least carbon pollution of all the fossil fuels.
Coal emits more than gas or oil.
Natural gas
coal
carbon dioxide
The role of fossil fuels in the carbon cycle is to produce carbon dioxide. Fossil fuels are considered to be the highest contributors to pollution of the environment.
Fossil fuels are mainly made up from hydrogen and carbon atoms. When you burn them the oxygen in air chemically reacts with the hydrogen and carbon to produce carbon dioxide and water.
Burning fossil fuels and burning wood produce similar pollutants because wood and fossil fuels are both consist of hydrogen and carbon. Carbon dioxide is produced when burning wood and fossil fuel.
fossil fuels produce sulfur dioxide when burned because sulfur is present in them. things like coal which is carbon or gas which is a hydrocarbon are examples of this. fossil fuels are bad because sulfur dioxide causes acid rain. hope this helps :)
carbon dioxide
The role of fossil fuels in the carbon cycle is to produce carbon dioxide. Fossil fuels are considered to be the highest contributors to pollution of the environment.
Yes, it is true !
Fossil fuels are mainly made up from hydrogen and carbon atoms. When you burn them the oxygen in air chemically reacts with the hydrogen and carbon to produce carbon dioxide and water.
Burning fossil fuels and burning wood produce similar pollutants because wood and fossil fuels are both consist of hydrogen and carbon. Carbon dioxide is produced when burning wood and fossil fuel.
fossil fuels produce sulfur dioxide when burned because sulfur is present in them. things like coal which is carbon or gas which is a hydrocarbon are examples of this. fossil fuels are bad because sulfur dioxide causes acid rain. hope this helps :)
No, formation of fossil fuels (coal, oil and natural gas) removes carbon dioxide from the atmosphere.Burning of fossil fuels releases carbon dioxide.
The main content is the same. Of the wood is carbon and hydrogen, and that of fossil fuels is hydrogen and carbon. So when wood and fossil fuels are burnt the Carbon combines with oxygen to produce carbon dioxide and carbon monoxide, and the hydrogen combines with oxygen to produce water (H2O). C+O2--> CO2+CO
Fossil fuels produce large quantities of carbon dioxide when burned. Carbon emissions trap heat in the atmosphere and lead to climate change.
Burning of the fossil fuels releases the carbon dioxide.
Burning of the fossil fuels releases the carbon dioxide.
Industries and factories emit carbon dioxide through burning fossil fuels (coal, oil and natural gas), and from using electricity which is largely generated from fossil fuels.