Take a region where charcoal is the cooking fuel of choice, switch it out for a cleaner burning fuel that doesn’t contribute to global warming quite so dramatically, then, somehow, track the whole thing accurately enough that it’s possible to measure the tons of emissions the switch represents.

Finally, sell the avoided tons on a carbon market to companies that are looking to offset their own over-indulgence or maybe organizations that want to be carbon negative, doing their part to reduce global warming. The calculations had better be accurate or else those credits will not be worth very much in the long run.