Ask HN: Working in tech for climate?

I have been getting very conscious of climate change and human impact on the earth and would like to more actively contribute. I am quite a good senior programmer working in finance. Im having enough of devoting my life to things that seems so meaningless in comparaison with the real problems of humanity. Yet i see little I can do. Any one of you made the switch? Where did you find the job. Was it remote? Is it really making an impact?