Discussion
Assertion (A) : Increase in carbon dioxide would melt polar ice.
Reason (R) : Global temperature would rise.
Answer: A
Correct answer: Both A and R are true and R is the correct explanation of A.
Carbon dioxide traps outgoing infrared radiation, so more of it raises the global temperature - and it is warmer air and oceans that melt the polar ice. The rise in temperature is the mechanism linking the two. Both are true and R explains A.
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