Commercial aviation makes up 918 million metric tons of carbon. Bitcoin mining makes up 22 million metric tons. I'm less worried about NFTs than I am air travel.
Commercial aviation is at least useful: every year many millions of people travel for business, school, family, and pleasure needs which would be non-trivial to replace and aviation cargo is a key part of the global supply chain. If Bitcoin turned off tomorrow, some speculators would be very upset and nobody else would notice because 13 years in it still hasn't found something it can do competitively with alternative…
Those are valid use-cases.