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If the estimated cost on society "varies between 700 Euros [0] and 100.000$ [1]" then those scientists should be back to the drawing board because those two numbers can't make sense at the same time.

Also I don't see why only a small part of society should be paying for that "carbon tax" - all citizens should pay an amount corresponding to their energy spending and then we are back to miners not externalising anything.

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As said those are estimates. In any case you see the current carbon tax is not anywhere near the cost. It's worth to mention those cost depend on past, present and future emissions as well.

Where did I say that only a small part should be paying the real cost? That's a straw man.

And no: miners are externalizing exactly because the lack of a carbon tax. And from my experience they are not very interested in introducing one either.

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