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A positive feedback in the climate system

  • A.always destabilises the system completely
  • B.amplifies the initial change
  • C.opposes the initial change
  • D.has no effect on the response

Answer: B

The ice albedo feedback is the standard example, where melting ice exposes darker surface and absorbs more sunlight. Positive does not mean good, and it does not necessarily mean runaway. Ice albedo is the standard illustration.

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