I don’t see how Monzo could calculate this with any degree of accuracy. How would Monzo know what carbon impact I’ve had based on my spend in Tesco? They don’t see it itemised? How do they know if the coffee I’ve purchased comes in an recycled cup or where the beans originated from?
Either way, I think they need to focus on improving the current merchant data issues rather than add more to it. Of which is something they sadly say isn’t important in the grand scheme of things.