Maybe it's just my imagination, but it seems that climate change denialism is even more common among programmer and sysadmin types than among engineers and applied scientists more generally. Without diving into climate science*, here are a few brief hypotheses.
- Computers teach you to think in logic. Climate change modeling relies on the synthesis of a large number of statistical correlations rather than crisp rules of inference. Although logic and statistics are related (probability strictly generalizes logic, in a precise mathematical sense), a mind too narrowly conditioned to thinking in syllogisms may find it hard to reason statistically.
- Computing workers spend a lot of time on the Internet, and are disproportionately likely to be white, male, and libertarian. Climate change denialism is seen as not only respectable but intellectually heroic by (a significant faction of) the tribe of white, male, libertarian Internet users. (Arguably this merely begs the question, however, as the direction of causality may go the other way.)
- Computing workers are more socially isolated than people belonging to the same socioeconomic class. Because they spend less time around an intelligent, well-educated peer group, they are less socialized to defer to the knowledge of others.
- Computing workers spend all their time around intricate machines which (a) they understand better than the general public, and (b) the general public has become heavily reliant upon. This breeds arrogance, and arrogance breeds disrespect for expertise in general. Disrespect for climatologists is simply a special case of this phenomenon. This, however, is true of almost any profession involving specialized knowledge, from plumbing to physical therapy to nursing; so this factor might not prove decisive, except for the next bullet...
- Computing workers are, on average, more "autistic" and less "empathetic" on the autism/empathy spectrum. That is, they are unusually incompetent at modeling the mental and emotional states of other people. As a result, they fail to place themselves in the shoes of professional climatologists. That is, they do not imagine that most professional climatologists have worked hard to become experts in an esoteric and demanding (which is to say nerdy) intellectual discipline; might be driven by passion and curiosity and a desire to get it right; might along the way have been exposed to vast volumes of knowledge with which the lay observer is not familiar. In short, it is much easier to view literally thousands of scientists worldwide as a species of fools, liars, and conspirators when one assumes that they are nothing like oneself. (I strongly suspect that fewer IT workers would be climate change denialists if they realized that climate scientists are natural science geeks like them, whereas the primary beneficiaries of climate change denialism are corporate suits who were probably shoving geeks into lockers in high school.)
*About which, er, you can say whatever you like, but I'm going to listen to this guy.