Anti-intellectualism and anti-science
Americans have always tended to distrust the government, the elite and expertise. This is nothing new. In his 1964 Pulitzer Prize winning book, Anti-Intellectualism in American Life, Richard Hofstadter identified two sources of American anti-intellectual sentiment: business, which he depicted as unreflective, and religion, particularly evangelicalism. With its market-oriented, pro-business, and pro-religious agenda, the Republican party is naturally more distrustful of intellectuals and academics, including scientists.
This is fertile ground for right-wing think-tanks and lobbyists to sow doubt in the minds of conservatives who have a cognitive bias against climate change. And there has been no shortage of those, from the Global Climate Coalition, the Koch brothers to the Cato Institute, the Heritage Foundation, the fossil-fuel industry or the Heartland Institute. In Merchants of Doubt, Naomi Oreskes and Erik M. Conway have shown how these groups use a strategy questioning scientific research similar to that used by the tobacco industry in the 1970s and 1980s.