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".
To fix this person's comment, this comment makes sense if by "problem" they meant "defending your coins from boycotters"--Monero is (supposedly) untraceable so presumably it is impossible to boycott specific "dirty" sources of Monero.