This is not a disagreement on scientific observations and conclusions. Its a recognition of an ethos which, if carried to its logical conclusion, will result in policies and regulations which will threaten their livelihoods. The idea that a government agency can intervene and say "your product or service (or your process for providing it) is injurious to public safety, health, or the environment" is a fundamental threat to what they consider the fundamental human right of this society, the entitlement to operate a business without any supervision or opposition from those who do not own businesses themselves.

Its the same motivation as those who fought against the recognition of the carcinogenic effects of tobacco. They didn't necessarily smoke, or even work for a tobacco company, they just didn't want public interference in private profits, and if they can do it to tobacco or oil companies then no one is safe.

People who own businesses already feel they are threatened by market constraints and competition. They feel they should therefore be exempt from any other form of supervision or control. Maybe Global Warming is not caused by human activity, just like maybe lung cancer may have nothing to do with cigarettes. But that's not the point, is it? That's why the argument over these issues has never been primarily about the science, its about the politics, which really means its about the money. It also explains how quickly arguments against these regulations so quickly morph into bogus constitutional questions or conspiracy theories involving sinister Communist cabals. Remember how they resisted seat belt laws? They simply didn't care how many people got killed, mandatory seat belts might cost them money.

Now, whether or not the proposed regulations will actually help solve the problem or not is a valid question, and should be debated. We had very good reasons to ban alcohol but we learned the hard way it simply wouldn't work. But that's not what these arguments and are all about, is it?

All the temperature graphs and climate models (or chest x rays and firearms deaths) in the world are not going to move these people. They feel they have a right to do these things, just like the antebellum Southerner believed he had a right to own slaves.