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Discussion :: Environmental Science

  1. At night, low clouds:

    2. A.

     Enhance the atmospheric greenhouse effect
    B.

     Weaken the atmospheric greenhouse effect
    C.

     Are often caused by the atmospheric greenhouse effect
    D.

     Have no effect on the atmospheric greenhouse effect

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    Answer : Option A

    Explanation :

    At night the reflection effect is zero so the greenhouse effect and reflection of thermal radiation dominate and the low thick clouds have a warming effect.
    The greenhouse effect could at most return 50 percent of the outgoing radiation back to the Earth

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