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a
increasing concentration of atmospheric oxygen
b
decreasing amount of atmospheric oxygen
c
increasing amount of atmospheric carbon dioxide
d
decreasing amount of atmospheric carbon dioxide
answer is C.
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Detailed Solution
The increase in the level of green house gases (e.g.,CO2, CH4, CFC, N2O etc.) has led to the considerable heating of earth surface leading to global warming.The relative contributions of various green house gases to global warming is CO2 (60%) > CH4 (20%) > CFC (14%) > N2O (6%).