You need to understand the political and cultural history. Environmentalism has been associated with leftist, feminist and communist ideology going back to the hippies and the antiwar movement (which makes it easy for many Americans to mistrust by default.) When Trump said he believed global warming was a Chinese hoax (remember that?) he was echoing a belief amongst the right that environmentalism and "global warming" was a plot to undermine American business and sovereignty, and that climate science supporting anthropogenic climate change was manufactured by "cultural Marxist academics" to push that agenda.
This conspiracy thinking has been pushed by Republicans, right-wing think tanks, coal, oil, manufacturing and like industries attempting to undermine public trust in climate science since at least the 1970s.
https://en.wikipedia.org/wiki/Climate_change_denial