Q. Which of the following greenhouse gases has the highest average life span in the atmosphere?

[A] Carbon dioxide

[B] Methane

[C] Chlorofluorocarbon

[D] Sulfur Hexafluoride

Answer: A
Notes:

Explanation:

Green house gasAverage lifetime in the atmosphereGlobal warming of on molecule of the gas over 100 years (Relative to Carbon dioxide = 1)
Carbon dioxide50 – 200years*1
Methane12 years21
Nitrous Oxide120 years310
CFC-12100 years10,600
CFC -1145 years4600
HFC – 134a14.6 years1300
Sulphur Hexafluoride3200 years23,900

Source: FORUMIAS

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