[01/02] A bitcoin miner in Pennsylvania is controversially burning waste coal and discarded tires to generate electricity: https://www.theguardian.com/us-news/2023/aug/31/bitcoin-mining-plan-pennsylvania-tire-burning This pollutes the air but cleans land. Is that practice wise or not?
It should be noted that only some kinds of cryptocurrency (notably Bitcoin) use the "proof of work" method that entails using lots of electric power. There are other methods.