Fascist types and parties are climate change denialists not because they don't believe the science, but because to them whether it's true or not is irrelevant:
It's a competing storyline. If you do something against the climate emergency you're already getting engaged with a community and have much less mental space for any mental storyline or feeling that those people peddle. Being green/doing stg about climate change is essentially a competing vision for the future.
@szbalint Not to mention climate change hurts poor brown and black people the most, and creates refugee crises that fascists can point to to say "you need a strong leader like me to save you from these foreign Invaders."