That’s a decades long process. We need proper action done within this decade.
We don't know that. If it turns out that the actual ECS value is higher than predicted we're already fucked because whatever faction we might take today should've already been taken decades ago. If a global humanitarian crisis is mere decades away, no changes we'll feasibly make today or in the near future will stave it off.
You’d be surprised how many people would take that over a ride with other people.
An alternative is also that those who can, do their job remotely. Covid proved the feasibility of that. You couldn't pay me enough to start commuting or doing my own grocery runs again. I only go outside for enjoyment and none of it involves vehicles. Unless said vehicle is a bicycle, because my dog really enjoys cycling.