Doing a home greenhouse gas inventory is not that hard if you only track energy use and transportation fuels. It's simple arithmetic. But what about your purchases? These 'scope 3' emissions are a nightmare. But now there is an index linked to a credit card that can report greenhouse gases associated with your purchases. Pass this onto your local bank manager and ask if they can add it to your credit card. It probably won't happen right away, but if we don't ask, it won't ever happen.