What do we do about conspiratorialist global warming deniers?

There's been some research lately finding that people tend to form opinions on subjects based on their ideology, and then adjust their interpretation of the facts to fit their ideology. A great example is the "birther" movement, where something like half of Republicans had doubts that President Obama... show more There's been some research lately finding that people tend to form opinions on subjects based on their ideology, and then adjust their interpretation of the facts to fit their ideology. A great example is the "birther" movement, where something like half of Republicans had doubts that President Obama was born in America despite the plethora of evidence that he was.

Obama recently released his long form birth certificate, which the conspiratorial birthers claimed was what would convince him. A new poll found that 10% of Republicans thought it was a forgery and another 18% still have doubts on the subject.

Basically they don't want to accept the reality that Obama is president, so they create this conspiracy theory whereby he's a fraud who they just have to unmask to make their preferred reality come true. If you present them with evidence they're wrong, they just wrap it into the conspiracy theory (the certificate is a forgery, the Hawaiian secretary of state and the media are in on the conspiracy, etc.).

Of course we see the exact same behavior from global warming deniers. There's nothing new about this psychology, but the difference now is that they can get on the internet and surround themselves with like-minded deniers in the blogosphere and right-wing echo chamber, whereas in the past, conspiracy theorists were constantly confronted with reality. Now they have their own denial bubbles.

I don't know what we do about this. It's been suggested that we need to convince these folks that conspiratorial thinking is irrational, but that's like convincing a Catholic that there is no god. But since facts and reality have no impact on this psychology, a different tact is necessary. Any thoughts?
Update: Thank you jim for exemplifying what this question is about absolutely perfectly.
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