Individual behavioral change is insufficient. A civilization-level crisis requires government intervention. Vote.
Just from the most immediate problems I could see a lot of profitable work in modeling wildfires, maybe using satellite pictures to identify the most vulnerable spots to light up etc. Also optimizing power usage over networks and things like that are exactly in the ballpark of tech. Is that whole problem space really just best left to the government to slowly add incremental improvements every 10 years? Yes vote but also maybe think about spending more than 1h every few years to think about the problem.
I think we need to do more than just vote.
You're absolutely right: voting is a necessary, albeit insufficient, step towards fixing many of the challenges we face.
However, the vast majority of people who happen to read my comment on here will, at best, only vote. I don't want anyone to skip out on the very important and relatively easy step they can take just because voting isn't a silver bullet.