video of moving and retreating glaciers

The CBC has a nice news piece that shows time lapse photography of both surging and retreating glaciers. Since glaciers are often a very important source of agricultural and drinking water for many areas, not to mention the importance of the Greenland ice sheet in holding water that would otherwise contribute to sea level rise. Anyway, here's something to look at and discuss.  Sometimes images really make something (like global warming) immediate and compelling.