I think the lowest friction way to do it is to just spend the interchange (the roughly 2% of purchases that credit card companies get from merchants that usuall

I think the lowest friction way to do it is to just spend the interchange (the roughly 2% of purchases that credit card companies get from merchants that usually funds cashback/rewards) on carbon capture. With your blessing, I can talk to some credit card company execs about this idea. Credit cards are powerful signalling tools, I can easily see a "Green Card" catching on, especially if people don't see any additional fees on their bill.