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