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Discussion

Match each feedback with its sign.
List I
A. Ice albedo
B. Water vapour
C. Blackbody radiation
D. Low cloud cover
List II
1. negative, since a warm body radiates more
2. positive, amplifying warming
3. uncertain, with both effects in play
4. positive, since warm air holds more vapour

  • A.A-2, B-4, C-3, D-1
  • B.A-3, B-1, C-4, D-2
  • C.A-2, B-4, C-1, D-3
  • D.A-4, B-2, C-1, D-3

Answer: C

The blackbody response is what stabilises the system, and cloud feedback remains the largest uncertainty in climate sensitivity. Adding the feedbacks together gives the overall response. Cloud remains the largest uncertainty.

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