Global warming deniers seem to be in the same camp as so-called birthers (crazies who believe conspiracy theories that President Obama isn't a US citizen). Both groups believe that there is some vast, politically motivated conspiracy by liberals to ... do something bad? But in the case of Global Warming, it's hard to figure out why liberals would engage in such a vast conspiracy that would require the complicity of virtually every climatologist in the world.
However, one thing is clear: Most global-warming deniers are also conservative religious fundamentalists who believe in creationism. These are the people who ignore expertise of virtually every scientist on Earth about evolution, and they apparently have no trouble extending their ignorance to the environmental sciences.
Now, unfortunately, business is forming what can only be described as a Devil's pact with these people: The United States Chamber of Commerce is casting its lot with these deniers, via a court trial that pits the EPA's policies and the "soundest peer-reviewed science available" against the global warming deniers.
This is shameful. The US Chamber of Commerce is deliberately and knowingly trying to thwart the will of American citizens, and ignore the health and welfare of the entire world, purely for profit. Denying global warming is good for business, so in spite of the morality of their position, and the foolishness, they're going to attack science in a non-scientific forum. All for a buck.
One can only hope that, like the infamous Scopes Monkey Trial, science will win in the court of public opinion.