Environmental Impact - and offsetting

Hello there! Over the last few years, we've spent a lot of time trying to accurately calculate our CO2 emissions - and having taken some steps to reduce them, we're offsetting via tree-planting initiatives. It feels like I've done tons of research here, but it's quite an opaque space! Do any of you have providers you rate? We're being very picky on projects that support the UN sustainable development goals, and contribute positively towards biodiversity. We've ended up going with a French company called Reforest'action - who I would recommend - but I'd love to hear what other people are doing!