Multiple Choice
Which of the following is true regarding atmospheric carbon dioxide levels?
A) They are currently well above the average of the past 600,000 years.
B) They are currently well below the average of the past 600,000 years.
C) Similar deviations from the average have occurred over the last 600,000 years.
D) a and c
Correct Answer:
Verified
Correct Answer:
Verified
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