Human activities in the recent past have caused the increased concentration of carbon dioxide in the atmosphere, bu a lot of it does not remain in the lower atmosphere because of

Human activities in the recent past have caused the increased concentr

1.	Human activities in the recent past have caused the increased concentration of carbon dioxide in the atmosphere, bu a lot of it does not remain in the lower atmosphere because of
A.	1 and 2
B.	2 only
C.	2 and 3 only
D.	3 only
Answer» D. 3 only

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Human activities in the recent past have caused the increased concentration of carbon dioxide in the atmosphere, bu a lot of it does not remain in the lower atmosphere because of

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