Environmental Science
Of the gases listed below, which is not believed to be responsible for enhancing the earth's greenhouse effect?

Carbon dioxide (CO2)
Chlorofluorocarbons (CFCs)
Molecular oxygen (O2)
Methane (CH4)
Nitrous oxide (N2O)

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Environmental Science
Low clouds retard surface cooling at night better than clear skies because:

The formation of the clouds releases latent heat energy
The clouds start convection currents between them
The water droplets in the clouds reflect infrared energy back to earth
The clouds are better conductors of heat than is the clear night air
The clouds absorb and radiate infrared energy back to earth

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Environmental Science
At night, low clouds:

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

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