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Environmental Issues

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  1. Which one of the following is the correct percentage of the two (out of the total of 4) green house gases that contribute to the total global warming?
    1. CFCs 14%, Methane 20%
    2. CO2, 40%, CFCs 30%
    3. N2O 6%, CO2 86%
    4. Methane 20%, N2O 18%
Correct Option: A

CFC 14%, Methane 20% is the correct percentage of the two (out of the total of 4) green house gases that contribute to the total global warming. A regular assessment of abundance of green house gases and their impact on global environment is being made by IPCC (Inter-Governmental Panel on Climate Change). The various green house gases are CO2 (warming effect 60%), CH4 (effect 20%), chlorofluorocarbons or CFCS (14%) and nitrous oxide (N2O), 6%). Others of minor significance are water vapours and ozone.


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