Ask HN: What can a software engineer do for Climate Change?

I currently work at a FAANG, and in a few years I will have saved enough to pay off my house and any other large expenses. We live relatively simply and aside from these large one-time expenses, can subsist on about 25% of what my current after-tax total compensation is.

Once the big stuff is paid off I can no longer justify not working on climate change. So what are the current most promising directions for fighting climate change, where an experienced software engineer can make a real contribution? What are the most effective organizations working on them?