On January the 13th at a particular place in Greenland the sun rises above the horizon. It is the first time the sun rises at this place all winter, when the sun usually hides below the horizon and leaves this place in arctic darkness. On January the 13th the sun has done this for a long time, as regular as clockwork. This year the sun behaved unexpectedly. In defiance of our predictability of it, it rose 48 hours early on January 11th. But it was not the sun that was misbehaving, it was us. Our effect on the atmosphere is warming our small blue dot and it has lowered the level of the ice sheets in Greenland. The local horizon had changed and the sun was oblivious to us or our predicament.

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