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Relative contributions of CO2, CH4, CFCs and N2O?

CO2 – 60%, CH4 – 20%, CFCs - 14% and N2O – 6%
CO2 – 70%, CH4 – 10%, CFCs - 14% and N2O – 6%
CO2 – 65%, CH4 – 15%, CFCs - 14% and N2O – 6%
CO2 – 60%, CH4 – 24%, CFCs - 10% and N2O – 6%
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