The problem is humans are really bad at perceiving externalities at this scale, cause / effect between small actions and large effects, and effects that play out over the span of their lifetime rather than the span of their day. The denialist rationale shifted over the years from doubting the very basis of the science, to claiming its just a short term blip, to its natural long term cycles, to … everything that involves not looking up.

I think the truth is we won’t really take this seriously globally until the changes are so severe that it’ll take generations to undo if ever.