Environmental Science
One greenhouse gas contributes 14% to total global warming and another contributes 6%. These are respectively identified as

CFCs and N2O
CFCs and CO2
Methane and CFCs
N2O and CO2
Methane and CO2

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Environmental Science
At night, low clouds:

Have no effect on the atmospheric greenhouse effect
Weaken the atmospheric greenhouse effect
Are often caused by the atmospheric greenhouse effect
Enhance the atmospheric greenhouse effect

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