As always. This becomes one of the chalenges of Bitcoin mining so far. More effective and efficiency mining energy are really needed. But what kind of energy is that?
So far, mining always relates to the use if big energy. Hopefully there will be another energy to be used for mining friendly environment.
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Swedish Regulators Call for EU Ban on Crypto Mining, Power Company Defends Indus
Alarmed by the rising energy needs of cryptocurrency mining, Sweden’s financial and environmental regulators have recently proposed an EU-wide ban on proof-of-work coin minting. The Swedish officials believe this would encourage a move towards a more energy-efficient extraction of bitcoin... See more for yourself here.