All human action is individual human action. It got us into this problem, and is the only thing thay will fix it.
My only point was about _collective_ behavior change that is often advertised as a way to stop climate change that is advertised by many. I think that’s completely pointless and impossible. For example I do nothing to conserve anything in my day to day actions other than not wasting money or time. So if you can make CO2 reduction possibly simply by saving money and time then it’ll happen automatically.
Also I’m not so pessimistic about the current direction as you. We’re headed for a 3 degrees C change in temperature which isn’t going to have the most disastrous impacts that could have happened. There’s still also a lot of emerging tech that could play out and reduce those predictions further.
For example by making electric vehicles attractive Tesla did more for the environment than possibly any single company ever by causing the shift to EVs in the general populace’s psyche.
Alternatively by doing things like banning plastic straws you instead get malicious compliance and dislike for the policies. That will never change things in a positive direction in the long term.