Tt is the potential interference in the so-called "free market" that is fueling the ire of those who regard the human factor in global warming as a "lie", or a "scam". Suddenly, a long-standing 'way of life' in the US, namely the freedom to conduct business exactly as we please, is being threatened by the specter of some faceless international regulators telling us what we can and cannot do, in an area which we have dominated for a century or more. (How dare they!). Our energy M.O. has given rise to the national infra-structure as it stands currently, and to have some global regulations forced upon us is an absolute no-no. To be dictated to by some non-US body, comprising people of all nationalities is akin to giving up a part of our national sovereignty. The allegiance of many groups who lead the skeptics' charge tend towards the "libertarian" end of the political spectrum, especially in regards to the sacred principle of "keep government out of my business".
When politics interferes with science and people (from either side of an argument) fudge the facts, cook the books, dry-lab the studies and generallycheat to bolster their political stance, or to save face, there are no winners. The last one standing never wins; we all lose.