Human activities i the recent past have caused the increased concentration of carbon dioxide in the atmosphere, but a lot of it does not remain in the lower atmosphere because of 1. its escape into the outer stratosphere. 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 ?
Options
(a)1 and 2
(b)2 only
(c)2 and 3
(d)3 only
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