I'm basically an only moderately well-informed amateur on this topic. I'm aware of five main things to track in terms of the world's ICE:
Arctic sea ice, trackable by area, extent, or mass (trending downwards)
Antarctic sea ice, trackable by area, extent, or mass (trending upwards)
Greenland ice sheet, trackable by
mass (trending downwards)
Antarctic ice sheet, trackable by
mass (trending downwards)
Glaciers worldwide, trackable by
mass (trending downwards)
How would people rank these in terms of importance? I'd be tempted to put the AIS first as the single greatest amount of ice, followed by the Greenland ice sheet, arctic sea ice, antarctic sea ice, and finally glaciers worldwide, but I'm sure there are other interpretations. Also, am I missing anything important? (Permafrost, maybe?)