that is not the ugly side of "bitcoin", i would go as far as saying it has nothing to do with bitcoin. it is all about the ugly side of the electric producing companies that have been producing it inefficiently and with lots of pollutions. bitcoin is just using what is offered to it by them. we can't change everything. we have revolutionized the concept of currency from being centralized to being decentralized, you can't expect us to also revolutionize the electricity production too!
I agree with you that it is not the bad side of bitcoin because bitcoin has nothing to do with environmental pollution. When energy use begins to be inefficient we cannot blame what other people do, because more and more energy technology is increasingly needed.
The rest is the task of the energy company to be smarter in developing strategies.