Slatest - your news companion. The margin of the Greenland ice sheets. Hannes Grobe , Alfred Wegener Institute for Polar and Marine Research. 1992. On Monday, Greenland began to melt. Parts of Greenland melt every year and the whole thing freezes again each winter, but lately, thanks to global warming, the melting has come earlier and then peaked in the summer at higher levels than usual. Story here.