Multiple Choice
Which of the following is true regarding the concentration of CO₂ in the lower atmosphere?
A) It is higher than any time in the last 800,000 years.
B) It has stabilized.
C) It is presently at 350 ppm.
D) It is unrelated to the replacement rate for harvested and cleared forests.
Correct Answer:
Verified
Correct Answer:
Verified
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