Blockchain has faced criticism for its environmental impact, particularly with proof-of-work (PoW) systems like Bitcoin's, which require massive energy consumption. But there’s good news: new consensus mechanisms like proof-of-stake (PoS) are much more energy-efficient. Ethereum’s switch to PoS is a huge step forward, and other blockchains are following suit. With ongoing innovation, blockchain can become more sustainable while still delivering on its potential.