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Cardano is a proof-of-stake blockchain and has been estimated to use electricity equivalent to 57 US homes, which can be met by a single wind turbine. The founders of Cardano set out to tackle the unsustainability of proof-of-work blockchains at the outset. In 2021, academics and researchers reckoned that Bitcoin and Ethereum used as much power as a country the size of Argentina – 100,000 times as much energy as all the proof-of-stake blockchains.