Even if you're not a big doomer, apocalypse theorizing and even planning/preparation can actually be fun and, if you're the kind of person to worry about that stuff, lower your stress. Feeling prepared for an emergency can reduce the amount of distress it causes, especially if you're already aware of the risk of the emergency.

Put differently: if you're concerned about the oncoming climate disaster, and find it causes you mental anguish, then you can either sit around and read more about doom, or you can find ways to release some of that tension. One possible way is to feel as if you're becoming as prepared as you reasonably can. This is much like, say, learning to swim because you're going on a boat. Yes, you probably won't fall in the water, but I bet you'll be much less scared of what might happen if you do.