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The Merge was no small feat, swapping out one way of running a blockchain, known as proof-of-work, for another, called proof-of-stake. The payoff is potentially gigantic - Ethereum should now consume 99.9% or so less energy. Ethereum’s developers say the upgrade will make the network – which houses a $60b ecosystem of cryptocurrency exchanges, lending companies, non-fungible token (NFT) marketplaces and other apps – more secure and scalable, too.
According to Beiko, the energy consumption of proof-of-stake is “not even a rounding error in terms of environmental impact.” “Proof-of-stake is like running an app on your MacBook,” he said. “It's like running Slack. It's like running Google Chrome or running Netflix. Obviously, your MacBook plugs into the wall and uses electricity to run. But no one thinks about the environmental impact of running Slack, right?”
https://www.coindesk.com/tech/2022/09/15/the-ethereum-merge-is-done-did-it-work/
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