A lot of what needs to happen, IMO, is culture change. Doing all of the things you mentioned is only a drop in the bucket, but one person putting in that effort normalizes it. That makes other people feel more comfortable and motivated to do the same. It might not feel like much, but it's definitely better than nothing.

Also, if you're in tech and you have the luxury of changing jobs, there are companies doing good work on climate change. Electric vehicles, solar power, making production and supply chains more efficient, etc. We can make it easy/cheaper/more pleasant for people/corporations/governments to make the right choices.