For as long as climate change has been a public agenda item — let’s date it back to 1988, when James Hansen testified to Congress — there has been a large faction within the public that refuses to accept it, composed primarily (not entirely, but primarily) of conservative white men.
It’s difficult to remember these days, but that faction did not always dominate the Republican Party. Establishment Republicans from George H.W. Bush to George W. Bush acknowledged that climate change is a real problem requiring a policy solution. John McCain put forward his own cap-and-trade plan when he ran against Obama in 2008.
But denial was always closer to the conservative heart than acceptance was. When the Tea Party swallowed the GOP in 2010, it eradicated the last shreds of accommodationism on climate. Since then, the party, at least the public face of the party, has been almost entirely dominated by old-school, unapologetic denial. The few remaining “moderates” in the party quickly fell in line and went silent (including courageous “maverick” John McCain).