There is an air of "tipping points" about. This is an idea (possibly coined by Schellnhuber) where "the balance of particular systems has reached the critical point at which potentially irreversible change is immenent, or actually occurring". That quote, somewhat bizarrely, comes from the Books and Arts section of Nature (here), which is a slightly dodgy regular section where they make a feeble stab at pretending the "two cultures" ever talk to each other.
And so the piccy is S's attempt to find an "icon" for climate change. But (ibid) "the issues surrounding climate change are extraordinarily complex. Can an image be found that is both simple and good science? Given the contentious nature of the debates, particularly in the United States, it is unwise to offer hostages to fortune by parading vulnerable predictions". I don't think the image is simple: is it good science?
But first of all, what about the "tipping points" concept anyway? I've previously pushed the idea that the climate is stable (in the absence of perturbation). You could argue, quite plausibly, that we shall soon have emitted enough CO2 to raise the T enough that we will be committed to melting Greenland. Perhaps that counts as a tipping point. But its slow. Its on the map as "instability of the greenland ice sheet" which is an odd way of phrasing it but has the "virtue" of implying speed.
But enough quibbling. The one I reacted badly to was "Antarctic ozone hole". Its an envoronmental icon, but hardly a tipping point: as far as its known its reversible, and on a long slow trend to being reversed (err, as long as GW doesn't cool the stratosphere too much...).
As to all the rest... I dunno, its a bit vague isn't it? I'm not sure I'm too keen on this search for an icon stuff.
A couple of BTW's to finish off: (1) I'm down to wiggly worm, so it looks like status is based on snapshot rather than accumulated - must get posting again. (2) I'm off conferencing for a while at the end of the week, so will be dropping further down. (3) I may get assimilated by the Borg in the near future anyway... Mark seems to have self-assimilated.