What is an example of a positive feedback mechanism in climate systems?

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Multiple Choice

What is an example of a positive feedback mechanism in climate systems?

In climate systems, a positive feedback amplifies an initial change. An example is ice-albedo feedback: as temperatures rise, ice and snow melt, reducing the Earth’s reflectivity (albedo). Darker surfaces absorb more solar radiation, which causes further warming and more melting, creating a self-reinforcing loop that strengthens the original warming signal. This is why it’s considered a positive feedback—the output (increased warming and melting) feeds back to produce even more warming. In contrast, clouds reflecting sunlight tend to damp or offset warming (negative feedback) by blocking some solar energy, ocean currents mainly redistribute heat rather than amplify the initial change, and increasing vegetation removing CO2 reduces greenhouse gas levels, also acting to slow warming (negative feedback).

In climate systems, a positive feedback amplifies an initial change. An example is ice-albedo feedback: as temperatures rise, ice and snow melt, reducing the Earth’s reflectivity (albedo). Darker surfaces absorb more solar radiation, which causes further warming and more melting, creating a self-reinforcing loop that strengthens the original warming signal. This is why it’s considered a positive feedback—the output (increased warming and melting) feeds back to produce even more warming. In contrast, clouds reflecting sunlight tend to damp or offset warming (negative feedback) by blocking some solar energy, ocean currents mainly redistribute heat rather than amplify the initial change, and increasing vegetation removing CO2 reduces greenhouse gas levels, also acting to slow warming (negative feedback).

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