There are more and more of them making these claims in the lead up to COP23 in Bonn. Check out my review of the coins claiming to be "green." Later this week, I will put out a video comparing "clean" mining vs. alternative consensus mechanisms, and another one on energy use in the top 20 cryptos. Hope the theme is a break from the typical grind.
https://youtu.be/54xjGVhDef4