Physics — Albedo & Feedback
Reflectivity and the ice-albedo feedback.
Rendering…
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A = \frac{\text{reflected}}{\text{incident}}
\text{ice} \approx 0.6, \quad \text{ocean} \approx 0.06
\text{Earth average } A \approx 0.3
\text{ice-albedo: warming} \to \text{less ice} \to \text{more warming}