We are becoming aware of two very important changes in the Arctic that you need to know about. These are separate thing but related, and both are almost certainly the outcome of anthropogenic global warming (AGW). They are:
The sea ice that covers much of the Arctic Sea during the winter is normally reduced during the northern summer, but this year, the reduction has been dramatic. There is less sea ice in the Arctic Circle than recorded in recent history.
If it is happening in the rest of Greenland and the even bigger Antarctic ice sheet, then global ice loss and the sea level rise could jump as much as twice as fast as previously thought.