The concentration of carbon dioxide in the troposphere at the start of the Industrial Revolution was approximately
a. 280 ppm
b. 290 ppm
c. 300 ppm
d. 310 ppm
e. 320 ppm
Answer: A
The concentration of carbon dioxide in the troposphere at the start of the Industrial Revolution was approximately
a. 280 ppm
b. 290 ppm
c. 300 ppm
d. 310 ppm
e. 320 ppm
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