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Well this site gives a bit of a summary..."The University of Cambridge and Digiconomist estimate that the two largest crypto-assets, Bitcoin and Ethereum, together use around twice as much electricity in one year as the whole of Sweden."
I'm willing to wager it doesn't even weigh in.
World Environment Day & Celebrates 50 Years of Earth Day:
It agrees that Crypto is bad for the environment but...
"The extraction, mining, milling and smelting of metal to produce coins is incredibly energy-intensive, and the U.S. Mint estimates that some 40,000+ tons of metal are used to make coins in the country, each year. "
With advancing tech, we might one day find a way to have unlimited energy via fusion (or some other tech)... but any physical currency will always be a problem...