The American Republican Party is the only major political party with an official policy of climate change denial. This is not because of the President (Trump got the nomination because his denial of science upset few people), but because denial and fossil fuel money took over the party about a decade ago.
There are others, mostly hard-right European fascists.
And, we could add, the US EPA was established by Richard Nixon.The G.O.P. wasn’t always an anti-environment, anti-science party. George H.W. Bush introduced the cap-and-trade program that largely controlled the problem of acid rain.
As late as 2008, John McCain called for a similar program to limit emissions of the greenhouse gases that cause global warming.
The truth is that most prominent climate deniers are basically paid to take that position, receiving large amounts of money from fossil-fuel companies.
But after the release of the recent National Climate Assessment detailing the damage we can expect from global warming, a parade of Republicans went on TV to declare that scientists were only saying these things “for the money.” Projection much?Climate Denial Was the Crucible for Trumpism.... we can now see climate denial as part of a broader moral rot. Donald Trump isn’t an aberration, he’s the culmination of where his party has been going for years.
See also, from a once Reaganite supporter:
The Right's Climate Change Shame
It is not true any more to present climate change denial as "conservatism". Climate change deniers are radical reactionaries.