Ask HN: How to find a job in sustainability as a software engineer?

Hi HN, a friend of mine is frustrated by their company's move towards NFT adoption. They are considering looking for jobs at companies whose mission might serve to counteract NFT technology's negative environmental effects. They're having a hard time finding interesting companies in the sustainability space, but surely there must be something out there? Are there any job boards or similar resources for software engineers who want to work in green tech? Please share them so that I can pass them along. Thank you in advance!