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>How much CO2 pollution is each transaction responsible for

Near 0. PoW is about agreeing on what the current state is. A transaction itself doesn't cost very much energy. If you were to process 0 transactions for the next agreed upon state it would take just as much energy as processing thousands of them.

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This is equivalent to claiming riding an airline doesn't emit any CO2 because the plane was going to fly anyways

Flying an empty plane does not generate a rare collectible that the airline is speculating may some day be worth over six figures each.

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