I know this comment won't be accepted very well here on HN, but I think this is one of the reasons most people who don't believe in climate change don't. Science, and the subsequent reporting on it, has been consistently reporting for the past 20 years that climate change is real, and it's worse than we thought. Every few months, there is a new study being widely reported saying that X new evidence is proving that things will be much worse than we thought. If there was a study every once in a while that said X study about climate change was wrong, and we didn't consider Y factor, but climate change still seems to be headed in a dangerous direction, then I think people might be more willing to accept the thesis.
Of course, the paper doesn't suggest that we are wrong when we suspect systemic error, and skeptics of climate change may very well be wrong, but maybe this will help others understand their skepticism.