During the past 400,000 years, carbon dioxide in the atmosphere has been between a range of _________ ppm, in the past hundred years it has changed to ppm.

A. 150 to 250, 100
B. 100 to 200, 150
C. 30 to 40, 70
D. 200 to 300, 370

1 answer

D. 200 to 300, 370

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During the past 400,000 years, carbon dioxide in the atmosphere has been between a range of _________________ ppm, in the past hundred years it has changed to ________ ppm.