One thing that can tangibly help is to lay out the consequences of inaction. Just knowing the worst case (among likely outcomes) can help reduce anxiety substantially. Then assess how much control you have in addressing the problem and getting a better outcome, and how much effort that will cost you vs the consequences.

A lot of anxiety comes from the unknown. We may not be able to completely unmask the unknown, but we can often estimate the consequences. For example:

• climate change
  • worst case: weather patterns will get worse, and life in 50-ish years may totally suck
  • options to mitigate problems: move, make more money to afford more mitigations
  • control over preventing the problems: vote, reduce own consumption (minimal impact)
• job loss
  • worst case: can't afford rent or food, so homelessness possible
  • options to mitigate problems: expand circle of friends (more couches to surf), save up cash, get a side gig or two to fall back on
  • control over preventing the problem: work for a stable company, improve skills
• break up w/ SO
  • worst case: heartbreak, possible depression, ugly breakup could also hurt financially
  • options to mitigate problems: separate expenses, keep contact w/ friends, practice healthy behaviors (exercise, engaging hobbies, etc)
  • control over preventing the problem - open dialogue, go on regular dates w/ SO, ask friends for warning signs

And so on. If you can identify the worst case scenarios and your options, it's a lot easier to manage anxiety. Doing that can be uncomfortable, but it's basically what a therapist will do with you, so it's a great skill to learn.