In Gallup’s view, “These opposing trends by party suggest that higher levels of education reinforce core partisan positions; in this case, Republicans’ strong tendency to question or deny global warming and Democrats’ inclination to affirm it. The trends also suggest that partisanship rather than education is a main lens through which Americans view global warming and its effects, particularly for those who claim allegiance to one of the two major political parties.”I think the explanation is simpler. It's probable that they aren't being educated in the same way. The late founder of Arts & Letters Daily was chided for setting up a parallel site, Climate Debate Daily, that provides a constant feed of good arguments from both sides of the discussion. That's not how the academy operates, especially not when teaching undergrads. Those who are inclined to skepticism will look for the skeptical arguments, and educate themselves in them; those who are not will not otherwise encounter them.
I'm inclined to think that this field is much like physics: there's a broad consensus that we're close to understanding what's going on, but a small minority of stubborn scientists who persistently poke holes in the proposed consensual theory that are hard to close again. I think that means that, most likely and in both cases, the overarching theory is analogous to Newtonian physics, and Aristotelian physics before that: it's going to give way fundamentally at a point we haven't quite identified yet.
That's still no reason to avoid being concerned about many conservationist issues, such as the excess of plastic wastes in the oceans. Those are clear and persuasive problems that we ought to try to fix.