Ethereum Mainnet uses proof-of-stake, but this wasn't always the case.
The upgrade from the original proof-of-work mechanism to proof-of-stake was called The Merge.
The Merge refers to the original Ethereum Mainnet merging with a separate proof-of-stake blockchain called the Beacon Chain, now existing as one chain.
The Merge reduced Ethereum's energy consumption by ~99.95%.
The Merge will reduce Ethereum's energy consumption by ~99.95%.
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