You can read about Ice albedo at my previous post. In simple terms ice albedo refers to how much light is being reflected by the ice. Ice albedo feedback however refers to a positive feedback climate process.
A positive feedback climate process is a process in which the outcome is being amplified by a feedback. In this scenario when ice albedo decreases ice absorb large amount of radiation and it starts to melt. when it melts ice albedo is further reduced and it starts a vicious cycle that increase the melting of sea ice
Reference:
http://en.wikipedia.org/wiki/Ice-albedo_feedback
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