If you think it impossible for Americans to become more politically polarized over climate change, here’s some bad news from a fresh analysis of Gallup polling on the topic:

Despite a fair amount of progress since 2008 on national policies to address global warming, the gulf between Democrats and Republicans has widened appreciably and shows no signs of narrowing.

The gulf is even greater between the most committed partisans — very liberal Democrats and very conservative Republicans — which matters a lot because they vote in greater proportion and have more influence in candidate selection.

The gap has widened mostly in the rightward direction, with a hardening of Republicans’ positions of denial; Democrats’ concern has grown, too, with increasingly dire reports about the pace of climate change and the price of ineffectual responses but this shift has been weaker.

There’s little hope of narrowing the gap with, say, factual information or even personal encounters with signals of a changing climate; both Republicans and Democrats wear their party affiliation as a badge of personal identity and social relationship, and attend only to new information if it fits their pre-existing views.

And views on climate change — as with stances on “God, guns and gays” — have become cudgels for whacking the other side, which means that the substantial numbers of Republicans who favor progressive energy policies (even if for reasons other than climate concern) typically will not vote for Democrats who would enact them.

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These are the key conclusions of a striking paper, lightly covered so far in mainstream media, that appeared at the end of August in the journal Environment: Science and Policy for Sustainable Development (it caught my attention yesterday via David Roberts’ fine piece over at Vox).

The authors are two sociologists, Riley E. Dunlap of Oklahoma State University and Aaron M. McCright of Michigan State, assisted by one of Dunlap’s graduate students, Jerrod H. Yarosh.

When hope seemed justified

Trends in Americans’ view of climate issues is a topic Dunlap and McCright have been tracking for some time, and they published a similar analysis a couple of months before the 2008 presidential election — a point that in retrospect, at least, seemed full of promise:

Al Gore’s movie “An Inconvenient Truth,” released in 2006 and published in book form the following year, received considerable attention, and its message was buttressed by the Intergovernmental Panel on Climate Change’s (IPCC) 2007 Fourth Assessment Report proclaiming that the evidence for global warming was “unequivocal” and that it is “very likely” due to human activities. The impact of both was heightened in 2007 when “An Inconvenient Truth” won the Academy Award for Best Documentary Film, and Gore and the IPCC shared the Nobel Peace Prize. By the following year public concern about global warming rose to levels not seen since the late 1990s — prior to 9/11 and the Bush Administration’s “war on terror.” Political scientists Deborah Lynn Guber and Christopher J. Bosso capture the situation when stating, “The year 2007 — with its unlikely fusion of science, politics and old-fashioned Hollywood glamour — had seemed to mark a long-awaited tipping point for climate change,” a window of opportunity reinforced by growing corporate acceptance of the necessity of limiting greenhouse gas emissions and a multitude of climate action plans passed at the regional, state, and local levels. … And yet, two short years later, the pendulum had swung back with stunning speed and brutal force.”

To the standard explanations of how this happened — the massive and industry-bankrolled denial campaigns, the Obama administration’s initially go-slow approach, ineffectual efforts from environmental advocacy groups, the recession — Dunlap and McCright add the politically colored polarization of Americans’ attitudes on climate change and, not incidentally, a wide range of other environmental concerns.

One place this shows up, of course, is in the national legislature:

What was once a modest tendency for Congressional Republicans to be less pro-environmental than their Democratic counterparts has become a chasm — with Republicans taking near-unanimous anti-environmental stances on relevant legislation in recent years especially 2015.

Ratings by the League of Conservation Voters of Democrats and Republicans in Congress have diverged dramatically in recent years.

Another is public opinion, which drives the congressional posturing and also is driven by it. And there may be no better long-term measure of those trends than Gallup’s annual survey of Americans’ environmental attitudes — including six questions on climate change that have been asked since 1997. (Although, as noted here from time to time, other polls offer interesting contrasts and amplifications.)

Gallup respondents are asked if they feel the effects of global warming have already begun; if human activity has caused changes in Earth’s temperature over the past century; if news media exaggerate the serious of global warming; if most scientists agree that global warming is underway; if global warming presents a serious threat of harm within current lifetimes; and whether they personally worry a great deal about global warming.

Responses to Gallup’s question about whether people think global warming is occurring have also diverged along partisan lines.

How views diverge

On all of these measures but one — arguably the least significant of the set, concerned with whether warming’s effects are already being felt — the gaps between Democrats and Republicans have widened since 2008, and they were pretty big to begin with.

On the question of whether human activity is causing the planet to warm, for example, 43 percent of Republicans and 84 percent of Democrats agreed — a gap of 41 percentage points. In 2008, the gap was 32 points — 40 percent versus 72. (And in 2001 it was just 17 points, 53 percent versus 70.)

There was sufficient Republican increase in belief that global warming is already occurring in 2016 that the gap (after having widened for a number of years) was back to 34 percentage points. For the other five items we see an increase in the partisan gap of anywhere from five percentage points (seeing global warming as exaggerated in the news) to 14 percentage points (saying most scientists agree global warming is occurring) during the Obama era. … In short, the results indicate that the substantial partisan polarization that had rapidly built up in the first eight years of the new millennium has not abated, but has actually grown since 2008.

That “Republican increase in belief” is good news, I guess, and in fairness I also want to note that Gallup has measured in the last year or two some very slight upticks in acceptance of global warming realities by all partisans — Republicans, Democrats and independents (for detailed breakdowns and charts, you can read the whole paper here without charge).

But this should not be taken as proof that facts, or personal experience, or even receptivity to reshaping energy systems for non-climate reasons, have begun to matter more. Key excerpts from the paper: