alleryWithout greenhouse gases, Earth's average surface temperature would be about what?
A-18 C
B-5 C
C0 C
D15 C
Answer & Solution
Correct answer: A. -18 C
1. Greenhouse gases trap outgoing infrared heat.
2. Without them the surface would average a frozen minus 18 degrees Celsius.
3. The present comfortable average is about 15 degrees Celsius.
_Source: Wikipedia, Atmosphere of Earth, Emission_
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