Environmental Science
The most abundant gas in the stratosphere is:

Chlorofluorocarbons (CFCs)
Carbon dioxide (CO2)
Ozone (O3)
Nitrogen (N2)
Oxygen (O2)

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Environmental Science
At night, low clouds:

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

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