PE –
IMO, there are at least two primary components to the tribalism: identity aggression and identity defense. I see both, quite abundantly, coming from the “skeptical” side of the battle line in the climate wars.
Even if I were to grant that there is more fundamental variety in the “skeptical” arguments than among “realist” arguments (personally, I’ll reserve judgement until I see some non-purely anecdotal evidence on that ), and even if I were to grant that variety of arguments is an important metric for quantifying tribalism, it certainly isn’t the only one. Look at this blog and any other in the “skept-o-sphere” and you will find identity-aggression and identity-defense as an overriding characteristic (as you will on “realist” blogs also, of course).
And as I said, anecdotal observations aside, the evidence of a very strong correlation between ideology and views on climate change is overwhelming, IMO. It is even “dose-dependent,” ; for example the data show that among Tea Partiers the ideological association is stronger than among mainstream Republicans. Tea Partiers are more sure in their opinions about climate change just as they are more certain that they know a great deal on the topic and that they don’t need any more information to evaluate the science. That kind of “dose-dependency” is the kind of pattern that lends a depth of significance among associations.
“Alarmist” is a polemical term. I’m not saying that you (necessarily) intend it as a polemic, but the ubiquitous use of polemics in the climate wars is an indication of the identity-aggression I spoke of before. Just as the term “denier” is used as a polemic, so is the term “alarmist” or “warmist” … etc.
I’m certainly not in a position to evaluate the facebook posts of libz and conz on some large-scale basis, but it doesn’t take much in-depth study to see that polemics with reference to climate change are ubiquitous in mainstream conservative media, such as Fox News, Limbaugh, Hannity, O’reily, the Wall Street Journal, etc. IMO, the polarization and tribalism related to climate change is no different than what we see with so many other issues. For the vast majority involved, the issue of climate change is a proxy for a more generalized ideological warfare.
As for my anecdotal perspective, FWIW, my observation about the pervading ideological orientation at this blog and other “skeptic” blogs is quite different than yours.