[humaniania]

Based on screenshots posted to an unverified twitter account? Why would this get upvotes?

[mdoms]

The source is in the very next tweet.

https://link.springer.com/epdf/10.1007/s12599-020-00656-x?sh...

[jessaustin]

From the conclusion to that link:

...we found that they do not pose a large threat to the climate, mainly because the energy consumption of PoW blockchains does not increase substantially when they process more transactions.