Few in the industrialized world if anyone really gives a shite (1). Lots of well-fed educated westerners would lose sleep if "free" economy is coughing but don't really care about this. Run away capitalism creating the problem in the first place is also -ehm- the reason why mostly leftists seem to get it. Not that this helps. It just makes the whole thing even more partizan.
Sad truth is the guys that are really screwed (so far and at the foreseeable future) by this are not exactly HN commentators. To them this might mean drought and death next year but to us -fat cats- this apparently means a danger to economic development. We simply do not have our asses on the line (yet) - which is why we can talk this to death but do _nothing_ to really prevent it. We might wake up when we start losing relatives due to 50C heat waves. Who knows.
And even then, if we get it, who would actually do something? We -at a global scale- have been terrible at resolving much simpler crises. Want an example? Ebola virus was stopped last minute. Zika virus is on the loose and is gonna get worse (because Olympic games will go on at the epicenter despite hundreds academics calling for delaying them). If nobody makes money out of it nobody cares. Our whole system is simply dancing to that music.
So - let it roll babe.
1. Including my fat ass.