What is the biggest concern about CO2 in our atmosphere with regard to human actions?

A. The rapid rise in CO2 emissions over the past 50 years.
B. CO2 was not an important greenhouse gas until 200 years ago.
C. We have increased the amount of CO2 from <1% to over 10%.
D. We could easily remove all CO2 from the atmosphere if we wanted.


Answer: A

Environmental & Atmospheric Sciences

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