https://www.theguardian.com/technology/2018/nov/05/energy-cost-of-mining-bit... https://www.nature.com/articles/s41893-018-0152-7.epdf https://static-content.springer.com/esm/art:10.1038/s41893-018-0152-7/MediaO... https://www.qwant.com/?q=Quantification%20of%20energy%20and%20carbon%20costs... http://www.maxjkrause.com/ Link to actual paper above. Renewables below. https://twitter.com/C_Bendiksen/status/1136641061298876417 https://medium.com/coinshares/surprise-majority-of-btc-energy-sourced-from-h... https://coinshares.co.uk/bitcoin-mining-cost-june-2019/ Expect miners to explore private enviro friendly safe and efficent nuke plants as well. PoW projects also adapting to solving useful research problems, protein folding, radio astronomy, etc. All in, net, it's just sand and electrons, a simpler long term looking much greener than Fiat's chaos, inefficiency, and silly whims against freedom and markets. DYOR. $10k soon.