Multiple Choice
Which is true of the concentration of CO2 in our atmosphere?
A) It reached 400 ppm in 2013.
B) The rate of increase leveled out in 1976.
C) The level of CO2 was much higher in 1955 than today.
D) The level of CO2 is decreasing at 3.1% per year.
Correct Answer:
Verified
Correct Answer:
Verified
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