Global Warming

http://www.scientificamerican.com/article.cfm?id=update-1-reutersipsos-more-american

More Americans are beginning to "believe" in global warming!

I have always been fascinated by the linguistics people use when confronted with an idea that they do not agree with, especially when the idea is something that is factual.   What I am talking about is the use of the word "believe." By using this word, the idea in question is removed from being potentially factual and placed in the realm of opinion where it can be dealt with without having to remodel one's view of the universe.  Furthermore, an individual who uses this kind of language can dismiss the idea without considering the context or the facts backing up the claim. 

For a while now, climatologists and other who study the effects of weather and the changes in its patterns have been warning us of the impending dangers of continuing to live the wasteful and toxic lifestyles that we do.  Such claims ave been met with zealous opposition that rivals religious fanaticism.  The article touches on some of the most recent opposition faced by climate change (the new global warming) advocates; e.i. Rick Perry and his crusade against even admitting that the earth is a warmer place than it was 10, 20, or even 50 years ago, despite the mountain of evidence against this.  One of Perry's methods in combating the fact that our planet's climate is changing is to relegate this fact into the realm of opinion.  The diction he uses regarding the ideas and evidence of climate change is same as what one would use regarding an opinion, primarily by using the word "believe."

How does one go about changing the minds of millions of people, especially when they refuse to even regard your argument as even vaguely factual?