Ask HN: How do I get started for UX Design work in the sustainable space

I run a two-people UX boutique agency offering design, copywriting and content strategy services. We want to use our skills for social impact. Anyone here working in the sustainability sector like ecofriendly startup, green tech, clean tech etc? How do we get started? We are already working on a pro-bono consulting work for a metasearch engine for tiny house parking and communities in the US.