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I would love to see bitcoin having zero waste and impact on our environment but even now in it's current state it is much cheaper and environmentally friendly [1] than other methods like Gold Mining, Gold Recycling, Banking System Electricity Use, Paper Currency & Minting.

[1] https://www.academia.edu/7666373/An_Order-of-Magnitude_Estim...

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I have not fully read the text you linked to, but it is not necessary to do so to reject at least the part about the Banking System Electricity use: common sense suffices. Sure, the system requires much more energy, but it also does much, much more than Bitcoin. In fact, almost everything it does is not related to the currency itself and would still be required if Bitcoin were to become popular.

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