I think it’s obvious that most folks agree that global warming is real. The denial occurs when people disagree that it’s anthropomorphic (caused by people) and that there’s much that we can do to slow it down or stop it without returning to the “dark ages” or destroying civilization as we know it. Planetary climate changes have been going on for millenia as climate change over thousands of years is a normal phenomenon. So many “experts” try to claim it is caused by “x” or “y” without valid proof, hence the denial. A single huge volcanic eruption can cause as much climate change as what the entire industrial age may have caused (sans pollution) over the past hundred or two years. Even before there were “reasons” that the experts claim — climate cycled through its extremes. The plant and animal worlds either endured, adapted, or went extinct.
As long as humanity populates the earth, the cyclic nature of climate heating and cooling — “ice ages” etc. — will be noticed and measured and continue on without any major significant effect from our human activities. Changing the way societies function will not have a major change on the natural, cyclic nature of climate change, but will cause humanity to start new wars in an attempt to control it. Political differences will just accelerate the process — to the detriment of all humanity.