climate pledge. "There are only two major cryptocurrencies that have large energy usage. It's #bitcoin and #ethereum...proof of work is where all the energy usage comes from."
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ok sorry this was really poorly phrased -- the fact that it takes energy is a downside to it
it's also the security mechanism, so it's not clear what it would mean to say 'PoW without energy usage'
sorry about that, I get that this seems contradictory!
Bitcoin takes barren electricity/energy and performs ecological succession via PoW, creating a forest of incentives, sunk costs, security that allows for a flourishing mycelia, an interconnected web of economic agents.