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> The ones that stay PoW might solely use non-CO2 producing methods in the future

What does this even mean? How can a Blockchain possibly enforce that your electricity used in mining is coming from a carbon neural source?

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Blockchains can't and won't enforce it. They will be forced to rely CO2-neutral renewables when fossil fuels are taxed to oblivion and/or outlawed. This also points to the absurdity of blaming energy usage of things rather than attacking the root of the issue.

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