So is the contemporary art world. The contemporary art world is vastly polluting as well. How much GHG do you think is generated to run a museum, or warehouse, transport aircraft, ect, filled with bad contemporary art?
No-one is proposing that contemporary art is some sort of technological breakthrough that will completely revamp society, make everyone rich and change finance for the rest of time.
(Also, I'm sorry, but I do NOT believe that contemporary art consume even a tiny fraction of the power that cryptocurrencies do when nearly all of it sits in a handful of warehouses and never moves, just changes ownership abstractly. You would really need to prove this claim.)