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by MagnumOpus 3220 days ago
> significant portion of electricity consumed by Bitcoin is already clean energy

Electricity is very fungible, and hydro locations are limited. This means that when the (very limited) hydro energy is converted into heat to mine bits because it is easier to colocate some ASICs next to the dam than an aluminium smelter - then the smelter will run on slightly-pricier coal instead. The marginal carbon emissions can still be blamed on the coin mining.