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The two gases making highest relative contribution to the greenhouse gases are

1. CO2 and CH4
2. CH4 and N2O
3. CFCs and N2O
4. CO2 and N2O

Correct answer: CO2 and CH4

Solution

Carbon dioxide (CO2) and methane (CH4) are the two major contributors to the greenhouse effect due to their high concentrations and significant heat-trapping abilities in the atmosphere.

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