The point being that global warming denialism is not about science but focused on cheap public relations gimmicks. Here's a billboard put up by the far-rightwing Heartland Institute that proves the point:
Not much science to it. Simply juxtapose a picture of a disheveled mass murder beside "I still believe in Global Warming." This is just one of several billboards with the same message featuring infamous killers. Heartland Institute explains their campaign this way:
'Why did Heartland choose to feature these people on its billboards?
Because what these murderers and madmen have said differs very little
from what spokespersons for the United Nations, journalists for the
"mainstream" media, and liberal politicians say about global warming.
The point is that believing in global warming is not "mainstream,"
smart, or sophisticated. In fact, it is just the opposite of those
things. Still believing in man-made global warming – after all the
scientific discoveries and revelations that point against this theory –
is more than a little nutty. In fact, some really crazy people use it to
justify immoral and frightening behavior."
"All the scientific discoveries and revelations that point against this theory"? That's where the Heartland shill really thins out. If they had the science to refute the mountain of multi-disciplinary research that corroborates the theory of global warming, they wouldn't be putting up billboards of Ted Kaczynski. They and the fossil fuelers would be disproving or refuting the scientific consensus that's causing them so much trouble, so much that they have to resort to this sort of sophomoric stuff.
But they're right about one thing - some really crazy people use their very own denialism to justify immoral and frightening behaviour.