Re: Just another alarmist global warming rant
"See for an example the article Melting Glaciers Revealing Ancient Tree Stumps from a Warmer Period that describes that a complete forest was covered by a glacier. "
Thanks. The linked article is in Icelandic but Google Translate helps. It seems to be a follow-up to an earlier article which I'll try to find. I'd guess the glacier was a fairly immobile sheet of ice so that it preserved the trees in situ much as peat does. I'm not familiar with Icelandic palaeoecology but I find it interesting that 3000 years ago is about the time the Late Bronze age across a swathe of N Ireland came to a juddering halt.
As to your second point the 23 years seems to indicate that the figure was taken from the Nature article I linked a couple of times in this thread. There are a few of points to note about that: firstly that it refers only to mountain glaciers, not ice sheets, secondly that it was sufficient to raise sea levels by about 18mm and thirdly the rate of loss was accelerating. In that context think what "This means that the uncertainty of the estimated volume of glacial ice, not the volume itself but the uncertainty of the volume, is five times the calculated change in the last 23 years" really means.
The uncertainty is going to be a smallish fraction of the overall volume. In itself it's equivalent to 10cm rise of sea-level so that the potential rise is very much greater. Far from saying it's not as bad as it sounds, it's saying that the potential rise is very large indeed. It's also well to remember that a rise in sea-level will set off a lot of erosion on vulnerable coasts. Parts of, say, the East Anglian coast already have problems with coastal erosion; a 1 metre rise could be quite devastating.