Environmental Science
Without the atmospheric greenhouse effect, the average surface temperature would be:

Higher than at present
Much more variable than it is now
The same as it is now
Lower than at present

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Environmental Science
When clouds are viewed near the horizon, the individual cloud elements usually:

Appear farther apart than is actually the case
Appear lighter in color than is actually the case
Appear closer together than is actually the case
Appear to have more vertical development than is actually the case

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