Discussion
State whether the following is true or false.
A positive feedback necessarily leads to runaway warming.
Answer: B
Correct answer: False
Runaway requires the total feedback to exceed the stabilising blackbody response, and it does not. The Planck response is strongly negative - radiation rises as the fourth power of temperature - so a positive feedback amplifies the response to a forcing and reaches a new equilibrium rather than diverging. The amplification factor is finite: the water vapour feedback roughly doubles the direct warming and stops there.
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