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What Was the Approximate Concentration of CO2 in the Atmosphere

Question 71

Multiple Choice

What was the approximate concentration of CO<sub>2</sub> in the atmosphere in 1965? Use the smoothed curve for seasonally corrected data to make the determination. A) 400 ppm B) 380 ppm C) 340 ppm D) 320 ppm What was the approximate concentration of CO2 in the atmosphere in 1965? Use the smoothed curve for seasonally corrected data to make the determination.


A) 400 ppm
B) 380 ppm
C) 340 ppm
D) 320 ppm

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