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Which greenhouse gas has the maximum contribution towards global warming? 

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Resource efficiency reduces greenhouse gas emissions by 15–20% in 2050, with global emissions falling to 63% below 2015 levels when combined with a 2 °C emissions pathway.
The contribution of the greenhouse effect of carbon-containing gases to global warming turns out to be insignificant.
We show that substitution of natural gas reduces global warming by 40% of that which could be attained by the substitution of zero carbon energy sources.
Open accessJournal ArticleDOI
Bo Nordell, Bruno Gervet 
21 Citations
Such emissions from, e. g., the global use of fossil fuels and nuclear power, must contribute to global warming.
This study concludes the greenhouse-gas-induced warming is largely overwhelming the other forcings.
This suggests a limit on the use of global greenhouse gas inventories when applied to urban areas.

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