Discussion
The average earth surface temperature :
Answer: C
The average surface temperature of the Earth is about 15°C.
The global mean surface temperature is close to 15°C (about 288 K). Without the natural greenhouse effect the planet would radiate to space at about -18°C, so greenhouse gases raise the surface temperature by roughly 33°C.
28°C and 32°C are typical of tropical regions, not the global average, and 5°C is far too cold for the whole Earth.
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