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    Environmental Science
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    Essential Environment
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    Exam 14: Global Climate Change
  5. Question
    Recent Evidence from Polar Ice Core Analysis Shows That, Until
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Recent Evidence from Polar Ice Core Analysis Shows That, Until

Question 8

Question 8

Multiple Choice

Recent evidence from polar ice core analysis shows that, until now, carbon dioxide levels have never exceeded ______________ ppm in the last several hundred thousand years.


A) 25
B) 1000
C) 200
D) 300
E) 500

Correct Answer:

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