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Without the greenhouse effect, the average surface temperature of Earth would be about:

AMinus 18 degrees C
BPlus 15 degrees C
CZero degrees C
DPlus 5 degrees C
Answer & Solution
Correct answer: A. Minus 18 degrees C
1. The present average is 15 degrees Celsius. 2. Without the effect it would be a chilly minus 18. 3. Greenhouse gases trap infrared radiation. _Source: syllabus Biology, Chapter 16, Environmental Issues._
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