[gruez]

AFAIK monero runs on POW as well so from an environmental impact level I don't see how it's any different. From a traceability perspective I don't see a difference either because mining can be done anonymously. You really can't track a mined block to a specific power plant. I guess you can set up some sort of voluntary program for green miners, and treat non-compliant blocks as "dirty", but with monero this wouldn't be possible so everything would be treated as "dirty".