https://cryptobrowser.io/news/bitcoin-mining-becomes-more-and-more-energy-efficient-and-sustainable/
Bitcoin Mining Becomes More And More Energy-Efficient And Sustainable
Renewable Power Increased By 1% To 58.5%, According To A 2021 Q4 Survey
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https://cointelegraph.com/news/bitcoin-mining-becomes-more-sustainable-mining-council-s-q4-survey
Bitcoin mining becomes more sustainable: Mining Council's Q4 survey
Jan 19, 2022 - According to a Bitcoin Mining Council survey, the global Bitcoin mining sustainable energy mix hit 58.5% in Q4 2021.
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