'The internet is unfortunately way cheaper than therapy.'

My honest advice to most of this stuff on this list is do what you can for you and the ones you care about. Dont focus on stuff you cannot control and never control. Doesn't mean you can't think about them or ignore them but I have a problem of hyper focusing on stuff I cannot control. Contact your local lawmakers, go to some protests but stuff like climate change or the possibility of a world war is not something you as an individual can control (if they are this advice isn't for you). So dwelling on them for too long is only going to negatively affect your mental health.

TLDR:

">Climate apocalypse is bullshit. Droughts, Floods, Forest fires, Hot summers, cold winters, heavy snow falls, heavy rains, etc. have been happening for thousands of years and will continue. My father and his ilk can remember even worse weather catastrophe happening on the regular."
Ok Boomer.
">Mental health and therapy. Take up Stoicism. Read The Meditations. Think rationally and develop some mental fortitude."
I cannot believe that you actually think that stoicism is a healthy way to deal with mental health. And telling people to "develop some mental fortitude" is just a fancy way to say "Buck up and deal with it". Obviously I can't speak for you or your experiences, but it's the kind of statement that comes from a person who has never had to deal with any kind of mental illness, who's never had to go to therapy, who will look at a person who is actually mentally ill or depressed or suicidal and just can't feel a single shred of empathy for them or their struggles. Because to you they just seem weak, or that it's all in their head, and if they just "think rationally" then they'll be just fine.
Take a tour to a mental health clinic. Actually do some research about mental illness before you tell someone who hasn't eaten for days, or to someone who just can't find the energy or the will to even get out of bed to "Just think rationally". Because believe it or not, that's not how our goddamn brains work.