@JordiGH @bgcarlisle
I was in Canadian high school in the 90s, and #ClimateChange due to carbon emissions was accepted then (as I'm sure it is in the schools now).
A major source of denial is that the issue has gotten tied into #uspol. Any proposition by political adversaries must be fought.
It was not inevitably a left-right issue:
#MargaretThatcher opposed climate change in 1989 https://www.margaretthatcher.org/document/107817