Newsletters

I’m thinking of making one, but don’t really sign up to any apart from corporate ones, usually skincare, makeup and fashion, my old uni alumni one and things like time out. I never read them unless there is sale chat in a time when i want to buy or an interesting title tbh. What would you say your newsletter subscriptions are and if you find them useful or just more spam to ignore?

Also if anyone knows the best site to use please let me know! My newsletter would be about climate change related stuff