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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.

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13y ago
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11y ago

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).

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11y ago

(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.

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12y ago

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

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11y ago

There are only three basic fossil fuels (coal, oil and natural gas).

Of these:

  • Coal releases the most carbon dioxide (CO2). Coal is about 60% carbon, so one tonne of coal releases about 3.4 tonnes of carbon dioxide (the extra weight is the oxygen taken out of the air).
  • Oil is next. Burning one tonne of fuel oil emits 3.15 tonnes of carbon dioxide.
  • Natural gas (methane (CH4)) releases the least of the fossil fuels. Burning one tonne of methane releases 2.75 tonnes of carbon dioxide.
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6y ago

Natural gas releases the least carbon pollution of all the fossil fuels.

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Kenean Fitsum

Lvl 1
2y ago
next time add an explanation

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11y ago

Coal emits more than gas or oil.

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Wiki User

8y ago

Natural gas

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Anonymous

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4y ago

coal

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Q: Which three fossil fuels produce the least carbon dioxide?
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