Evidence from polar ice core analysis shows that,until now,global carbon dioxide levels have never exceeded ______________ ppm in the last 800,000 years.
A)25
B)300
C)200
D)1000
E)500

Question

Quizplus · Accepted Answer

Studies on polar ice cores have shown that the maximum concentration of carbon dioxide in the last 800,000 years was approximately 300 ppm, making option B the correct choice. Options A, C, D, and E are all significantly lower or higher than the established range.

Evidence from Polar Ice Core Analysis Shows That,until Now,global Carbon