Discussion
Assertion (A): The Planck or blackbody feedback is the fundamental stabilising influence on climate.
Reason (R): A warmer surface radiates more energy to space, in proportion to the fourth power of temperature.
Answer: D
Both are true and the reason gives the mechanism, and without it any positive feedback would carry the system away without limit. It is the term against which all the other feedbacks are measured when a climate sensitivity is estimated.
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