Positive Feedback
A system response that amplifies change and drives the system away from equilibrium, potentially causing destabilisation.
Real World
In the Arctic, melting sea ice exposes darker ocean water that absorbs more solar heat, causing further melting — NASA data show this ice-albedo feedback has accelerated Arctic warming at twice the global average rate.
Exam Focus
State the initial change, the amplifying response, and the resulting destabilisation — missing any step loses marks.
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