I think you are looking at this in the wrong way... NFT's seem to be an incredibly “green” technology. The whole market so far has used one persons life time energy use and how many 100’s of millions of dollars of value has been exchanged? Now how much does the average person make in their lifetime? A couple of orders of magnitude less at least... NFT’s are probably much more “green” than even regular art once you include the costs of the raw supplies used to make that art.