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 of1. Its escape into the outer strato-sphere.2. The photosynthesis by phyto-plankton in the oceans.3. The trapping of air in the polar ice caps.Which of the statements given above is / are correct ?

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 1. Its escape into the outer strato-sphere. 2. The photosynthesis by phyto-plankton in the oceans. 3. The trapping of air in the polar ice caps. Which of the statements given above is / are correct ?
A.	1 and 2
B.	2 only
C.	2 and 3 only
D.	3 only
Answer» D. 3 only

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