My dad grew up in the Great Depression. He fought in both WW2 in his teens and in Vietnam in his 40s. The world was on the verge of ending during WW2 and for many years after during the Cold War because of nuclear weapons.
There's always an Arquillian Battle Cruiser, or a Korilian Death Ray, or an intergalactic plague that is about to wipe out all life on this miserable planet. The only way these people can get on with their happy lives is that they do not know about it!
-- Men in Black
https://www.quotes.net/mquote/61255
People pay too much attention to the negative parts of the news and not enough attention to the positive parts.
When Iraq left Kuwait and lit oil wells on fire on its way out, it was predicted that it would burn for years and be a global climate catastrophe. When crack teams converged on the country, invented new methods on the spot and wrapped things up in a mere six months, it was not given the same level of media celebration that the hand wringing about the end of the world got. It was a footnote in more dramatic stories.
People get anxious when they feel they have no control. There are things individuals can do, but most people feel it doesn't really make a difference and that's partly because they aren't likely to get pats on the head from anyone for quietly doing the right thing.
Some things that help:
Walk more, especially as a form of transportation.
Use more daylighting and passive solar. This can be as simple as opening the window instead of cranking the AC.
Eat less meat.
I've lived under sentence of death for a long time. I"m still here. I've largely stopped listening to the whining of people who didn't actually care when it was just me facing a horrible, gruesome death but now they are all scared about their future, wah.
If you don't want this future, then do something about it. Among other things, I gave up my car more than a decade ago. People can make such choices. Most people just don't actually want to be personally inconvenienced by the coming apocalypse. They seem to want everyone else to behave better so as to preserve their right to do whatever the fuck they want.