Key points are: this mechanism of collection can be much more effective for non-profits. And importantly once the automated passive payments are in place, it is

Key points are: this mechanism of collection can be much more effective for non-profits. And importantly once the automated passive payments are in place, it is easy to give users other options for what to do with the money (it doesn't have to be trees but its probably the most marketable start outside the HN community). The napkin math on trees has been done quite a bit here already. I'm on mobile but I would look at the Stripe Climate thread for some references.