Non-fungible tokens have become big business in the cryptocurrency world. But NFTs and the ecosystems used to create them can be hugely energy consuming, and therefore, bad for the climate. Is it a problem we need to worry about? On this week's episode of Sky News ClimateCast, Anna Jones is joined by our climate correspondent Hannah Thomas-Peter, artist Joanie Lemercier, and Johannes Sedlmeir, a researcher in electricity use in blockchain technology at the University of Bayreuth. Editor: Paul Stanworth Producer: Soila Apparicio