Most global warming denialists I'm familiar with are old people who are set in their ways. Such people are most vulnerable to confirmation bias. Younger adults, on the other hand, are not so attracted or attached to dogma.
I, Dale Husband, along with many others, stand for my chosen causes in Care2 because I beleive in doing what's right, regardless of whether I get paid for it or not. And it's not just global warming either. I have also fought for teaching evolution and to get rid of the Bush regime and anything like it from corrupting America more.
I oppose denialists because they appeal to ingrained prejudices based on what certain people WANT to believe, regardless of the actual facts. The big oil companies, including Exxon, certainly feel threatened by the facts about global warming. The idea that we humans are messing up the Earth with greenhouse gases which will lead to global disaster within a century or two is indeed offensive to people's egos, because it means they and their descendants must make radical changes to their lifestyles to stop the damage THEY THEMSELVES WILL HAVE HELPED CAUSE. So instead, they LOOK for reasons to deny the truth about themselves and what is happening. People who claim to be experts will then put out fallacious claims all over the internet knowing desparate people are out there to grab it and spread it around. They play their victims like an instrument, really. That is the real scam, not what Al Gore and the IPCC do. Uncertainty about the facts is no excuse for denying them. And noting that the effects of global warming can have natural causes is no excuse for denying outright that man plays a role in that phenomenon. Those are logical fallacies and I will oppose, expose and depose them every time I see them, because I WANT THE HUMAN RACE TO SURVIVE INDEFINITLY! And being able to foresee the downfall of humanity (and global warming is but one cause for profound concern here) and not doing anything about it because you let yourself be misled by people that only live for this present reality is the worst form of nonsense I can imagine.