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Which gas contributes the most to greenhouse gases? 

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Some of the byproducts that are emitted as waste from this process, such as methane, act as greenhouse gases which greatly contribute to global warming.
The principal evolving gas in the process is CO2, which is also central to the greenhouse effect.
Carbon dioxide is the dominant greenhouse gas resulting from the burning of fossil fuels, and it comprises more than half of all man-made greenhouse gas emissions.
Open accessJournal ArticleDOI
Michael J. Prather, Jennifer A. Logan 
01 Jan 1994
20 Citations
Most of the important greenhouse gases and tropospheric oxidant gases have significant natural sources, which are not well defined today and may be changing; and thus, quantifying the role of combustion is difficult.
In addition, other photochemically important gases, such as carbon monoxide (CO), oxides of nitrogen (NO x ), and non-methane volatile organic compounds (NMVOCs), while they do not function as greenhouse gas, contribute indirectly to the greenhouse effect (Anonymous, 1998; ICF, 2007)
Results indicate that ventilation air methane is a key fraction of the total emissions of greenhouse gases releases in this activity (60–70%).
It can be concluded these three greenhouse gases may be influenced by some similar sources, especially for CO2 and N2O.
If current practices continue, atmospheric increases are likely for the greenhouse gases carbon dioxide, methane, nitrous oxide; and for the chemically active gases nitric oxide, sulfur dioxide,and ammonia.
Further results show that CO2 emission is the primary source of greenhouse gas pollution which is 71% of the total CO2 equivalent.
The released gas may enter the atmosphere, and contribute to greenhouse warming.
Natural gas has highest hydrogen-to-carbon ratio among hydrocarbon fuels, which helps in reducing greenhouse gas emissions.
Open accessJournal ArticleDOI
Donald J. Wuebbles, Katharine Hayhoe 
763 Citations
On a per molecule basis, it is much more effective a greenhouse gas than additional CO2.
), may contribute to budget of globally nature-derived greenhouse gases.
The greenhouse with CO2 supplied from bottles turns out to be superior to tthe greenhouse with CO2 supplied by burning gas.

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