Discussion
Consider the following statements about climate feedbacks.
1. The water vapour feedback is positive and substantial.
2. The blackbody response is negative and stabilising.
3. Cloud feedback is well constrained and known to be negative.
Answer: A
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: warmer air holds more water vapour, which is itself a greenhouse gas, roughly doubling the direct effect of carbon dioxide; and the increase in emitted radiation with temperature is the negative feedback that stabilises the whole system. Statement 3 overstates the case - cloud feedback remains the largest single uncertainty in climate sensitivity, and the best estimates place it as positive.
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