Paper 1 · People, Development and Environment
UGC NET June 2024 Re-Exam (26.08.2024) Shift-I
Which of the following is an example of positive feedback in the context of climate change?
AA warmer Earth radiates more infrared energy (heat) into space
BPlants remove carbon dioxide from the air
COceans remove carbon dioxide from the air
DMelting of snow and ice sheets results in reduced reflection of sunlight ✓ Correct
Correct answer: (D) Melting of snow and ice sheets results in reduced reflection of sunlight — Melting ice reducing reflection is positive feedback, so that is the answer.
Explanation
★Melting ice reducing reflection is positive feedback, so that is the answer.
★Positive feedback amplifies the original change rather than damping it.
★As snow and ice melt, the bright reflective surface is lost.
★The darker ground absorbs more sunlight and warms further.
★This extra warming melts still more ice, amplifying the warming.
★So this is positive feedback; radiating heat and removing carbon dioxide are negative feedbacks.
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