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Presently, the Annual Average of CO₂ Is About 400 Ppm

Question 27

Question 27

Multiple Choice

Presently, the annual average of CO₂ is about 400 ppm, and the concentration is increasing by about ____ ppm per year.

A) 2
B) 5
C) 8
D) 12
E) 15

Correct Answer:
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