Ask HN: What kind of businesses or opportunities exist with Carbon Offsetting?

I'm curious from both people running businesses in this space, what are you doing - but also just if anyone has ideas on things that are missing in the field. It's nascent area so there's probably a lot that could be built to support more carbon capture via offsets/etc.

I'd like to build things with positive impact, and I think collective community brainstorms on HN is a good place to start sometimes.

P.s. Bonus points for ideas that are software related, as I'd love to build software in this space but don't know what's out there or what's needed.