People just learn to repress things . Like sometimes if you have trauma or anxiety you can become hyper-aware of the dangers and horror in life to the point you basically can’t function anymore (at least this was my experience with ptsd). It’s not like those dangers don’t also exist for people who are well, they do but they just don’t register them, they repress them because they don’t believe that the threat exists for them personally, even if they are aware of it in general. And this is genuinely a healthy and normal way of engaging with life. So it’s natural and convenient to extend that kind of repression to something like climate change too, especially when that perspective is also tacitly supported by the belief systems of ideology, which is a foundational aspect of one’s psychology. For most people it’s a simple task to repress anything that would threaten their fundamental identity. We see what we want to see, unless something forces us to do otherwise. This is why the middle class is one of the more ingenious inventions of capitalism, because people who are materially comfortable will naturally avert and even defend themselves from recognising the realities of the system.