Jason Box's Meltfactor blog reports that albedo (ability to reflect light) of Greenland's ice sheet was significantly lower in April than it has been since before 2000.
If there is a self-reinforcing feedback system here we may have to reconsider our scepticism on climate change.
We don't necessarily accept that it's all the fault of humans, though it's still possible (as reported earlier) that the additional melt may be influenced by a light-absorbing darker layer on top of the ice, of atmospheric particles from the burning of forests and fossil fuels.
UPDATE: The Guardian newspaper has caught up with the story (12 June 2013).
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