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Carbon Dioxide (CO₂ ) Concentrations Over the Past 800,000 Years

Question 16

Multiple Choice

Carbon dioxide (CO₂ ) concentrations over the past 800,000 years A) have remained relatively constant. B) were much higher in the past than the present. C) fluctuated over time, but have been increasing since the Industrial Revolution. D) reached its maximum about 325,000 years before present.
Carbon dioxide (CO₂ ) concentrations over the past 800,000 years


A) have remained relatively constant.
B) were much higher in the past than the present.
C) fluctuated over time, but have been increasing since the Industrial Revolution.
D) reached its maximum about 325,000 years before present.

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