Buying an NFT requires buying ETH which increases demand for ETH and pushes up the price, encouraging more people to mine ETH, which uses more electricity. Also

Buying an NFT requires buying ETH which increases demand for ETH and pushes up the price, encouraging more people to mine ETH, which uses more electricity. Also another effect is pushing up gas fees as people compete to make transactions which again helps miners and encourages more new miners to rig up and join in.