Relative contributions of CO2 CH4 CFCs and N2O towards global warming are ........

Environment and Ecology (Easy) Envirnment and Climate Change

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Relative contributions of CO2, CH4, CFCs and N2O towards global warming are:

50%, 30%, 10% , and 10% respectively

60%, 20%, 14%, and 6% respectively

40%, 30%, 20% and 10% respectively

None of the above

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Explanation:

CO2 is the largest contributor towards global warming, followed by methane, CFCs and N2O. Global warming potential (GWP) is a measure of how much heat a greenhouse gas traps in the atmosphere up to a specific time horizon, relative to carbon dioxide. It compares the amount of heat trapped by a certain mass of the gas in question to the amount of heat trapped by a similar mass of carbon dioxide and is expressed as a factor of carbon dioxide an index of global warming potential for methane, carbon monoxide, nitrous oxide and CFCs relative to that of carbon dioxide. The major contribution is from CO2 (60%),CH4 (20%), CFC and N2O attributes to 14% and 6% respectively. Hence option 2nd is correct.